Title of Invention

A HONEYCOMB WITH INTERNAL CAVITIES IN PATICULAR FOR PURIFYING EXHAUST GAS FROM AN INTERNAL COMBUSTION ENGINE

Abstract The invention relates to a honeycomb body (1) having inner walls (2, 3) which define passages (4) which lead from an entry surface (5) to an exit surface (6) of the honeycomb body (1), at least in a subregion of the honeycomb body (1) a plurality of cavities (9) being present which are free of inner walls (2, 3) and are shaped and dimensioned in such a way that they each contain at least one spherical free space (10), the largest cross-sectional area (Qmax) of which amounts to atleast 10 times the mean cross-sectional area (q) to the passages (4) in the respective subregion (T).
Full Text The present invention relates to a honeycomb body with internal cavities for purifying exhaust
gas from an internal combustion engine. Honeycomb bodies of this type may have metallic or
ceramic base structures and are used to provide a large surface area, which interacts with an
exhaust gas, in an exhaust system. In particular, honeycomb bodies are coated with
catalytically active material and / or designed in such a way that they can separate fine
particulates out of the exhaust gas and convert them. Furthermore, honeycomb bodies of
this type are also coated with adsorber material which is used for the temporary adsorption of
pollutants, in particular hydrocarbons and / or nitrogen oxides.
Honeycomb bodies of this type typically have a multiplicity of passages which run
approximately parallel and lead from an entry surface of the honeycomb body to an exit
surface. In the installed state, therefore, exhaust gas flows through such a honeycomb body
more or less uniformly in a direction of flow, the distribution of the exhaust gas between the
individual passages of the honeycomb body initially being dependent mainly on the flow
profile at the entry surface. The prior art has also disclosed numerous measures which
influence the flow in the individual passages and / or the flow distribution in the honeycomb
body. Highly developed metallic honeycomb bodies which are constructed from individual
sheet-metal layers often use various known measures to optimize the flow properties of a
honeycomb body. A distinction is drawn in particular between two typical forms of
metallic honeycomb bodies. An early form, of which DE 29 02 779 A1
shows typical examples, is the helical form, in which substantially one
smooth and one corrugated sheet-metal layer are placed on top of one


another and wound helically. In another form, the
honeycomb body is built up from a multiplicity of
alternately arranged smooth and corrugated or
differently corrugated sheet-metal layers, with the
sheet-metal layers initially forming one or more stacks
which are intertwined. In this case, the ends of all
the sheet-metal layers come to lie on the outer side
and can be connected to a housing or tubular casing,
producing numerous connections which increase the
durability of the honeycomb body. Typical examples of
these forms are described in EP 0 245 73 7 B1 or
WO 90/03220. It has also long been known for the sheet-
metal layers to be equipped with additional structures
for influencing the flow and/or effecting cross-mixing
between the individual flow passages. Typical examples
of configurations of this type are WO 91/01178,
WO 91/01807 and WO 90/08249. Finally, there are also
honeycomb bodies in conical form, if appropriate also
with further additional structures for influencing
flow. A honeycomb body of this type is described, for
example, in WO 97/49905.
The present invention is based on WO 2004/022937 A1. It
is known from this document to produce honeycomb bodies
from perforated sheet-metal layers; the holes in the
sheet-metal layers may be larger than the cross section
of the passages. Honeycomb bodies made from perforated
sheet-metal layers of this type have particularly
favorable properties with regard to the distribution of
the flow in their interior, since pressure differences
in the individual passages are equalized by the holes,
and at the same time the gas flowing through is swirled
up, which improves the contact between it and the
surfaces. The number and position of the holes can be
varied within wide boundaries, so that it is possible
to produce honeycomb bodies which are adapted to
different conditions.


Moreover, WO 2004/022937 A1 describes how it is
possible to produce a large hollow space, for example
for accommodating a lambda sensor, in a honeycomb body
by forming suitable cutouts in the individual sheet-
metal layers during production. Modern manufacturing
techniques allow the accurate predetermination of the
location in a honeycomb body to be produced at which a
hollow space is to be formed. For further details,
reference is made to WO 2004/022937 Al, the content of
disclosure of which is hereby incorporated in full.
EP 1 428 577 Al also describes a honeycomb body with
holes in its sheet-metal layers. This honeycomb body is
wound helically from one smooth metal sheet and one
corrugated metal sheet. Of course, in all processes for
producing honeycomb bodies from metallic sheet-metal
layers with holes, the situation may arise whereby some
holes in successive sheet-metal layers are
approximately aligned with one another. This gives rise
to larger hollow spaces, referred to below as cavities,
more or less randomly in a honeycomb body. Without
special measures, in particular if the holes are
arranged evenly on the sheet-metal layers, these
cavities are very irregular in form and in particular
are generally greatly curved or even interrupted in the
outer region of a honeycomb body, depending on the
ratio of the foil surface area to the surface area of
the holes.
It has now emerged that for various applications, in
particular for eliminating particulates from an exhaust
gas, it is particularly advantageous if a relatively
large number of cavities which have, relatively large
dimensions in all directions are formed in a honeycomb
body. The difficulty in describing the properties of
cavities of this type is that these cavities are not
surrounded by continuous walls, but rather are defined
by holes which are more or less aligned with one


another in smooth and corrugated sheet-metal layers.
The edges of these holes form a type of envelope for
the cavity. One way of describing such cavities, which
are advantageous for the properties of a honeycomb
body, is to indicate how large a sphere would be
accommodated in a cavity. In the text which follows and
also with reference to the drawing, therefore, it is
attempted inter alia to describe the properties of
cavities on the basis of the largest sphere which could
be accommodated in a cavity. It will be immediately
obvious that it is impossible for any cavity in a
honeycomb body to accommodate spheres which are larger
than spheres which would fit through the holes in the
foils. The size of the sphere which fits into a cavity
is therefore determined on the one hand by the size of
the holes and on the other hand by the degree of
overlap between adjacent holes.
It should also be pointed out that when considering
holes in a corrugated foil for the present invention it
is always only the projection of the holes onto the
center plane of a corrugated foil which is considered.
The form of corrugation does not play a significant
role in the present invention and the formation of
cavities, but rather it is only the size of the
projection of the holes within a corrugated sheet-metal
layer which does so. However, the corrugation does play
a role in the size of the passages in a honeycomb body.
In the case of honeycomb bodies of a simple structure,
all the passages have approximately the same cross-
sectional area, but there are also honeycomb bodies in
which different passage cross-sectional areas occur
within a defined region of the cross section.
Therefore, the following text refers in general terms
to the mean passage cross-sectional area, which in the
simplest case means just the cross-sectional area of
each passage but in more complicated situations means,
for a specific region of the cross section of a honey-


comb body, the total cross-sectional area of the honey-
comb body divided by the number of passages in this
region of the cross section.
The present invention is based on the object of
providing a honeycomb body which has improved
properties with regard to flow conditions, pressure
loss, conversion of pollutants and/or particulates in
an exhaust gas.
This object is achieved by a honeycomb body in
accordance with the independent claim 1 and the
independent claim 8. Advantageous configurations and
refinements are given in the respective dependent
claims.
A honeycomb body according to the invention has inner
walls which define passages which lead from an entry
surface to an exit surface of the honeycomb body. At
least in a subregion, the honeycomb body contains a
plurality of cavities which are free of inner walls and
are shaped and dimensioned in such a way that they each
contain at least one spherical free space, the largest
cross-sectional area of which amounts to at least ten
times the mean cross-sectional area of the passages in
the respective subregion.
It has been found that although honeycomb bodies with
numerous holes in their inner walls allow good
compensation of pressure differences between the
individual passages, rectilinear flow filaments may
nevertheless form if there are not considerable
pressure differences between adjacent passages. These
flow trains simply flow uniformly through relatively
small hollow spaces, so that there is no particular
cross-mixing or increased conversion or separation of
particulates. This situation changes if the holes in
the inner walls are arranged in such a way as to form


at least one spherical free space, the largest cross-
sectional area of which is at least ten times the mean
cross-sectional area of the passages. This means that
at least ten passages located closely together open out
into the free space and lead out of it again on the
opposite side. With a cavity of this type of size, at
least considerable cross-mixing takes place, thereby
promoting the desired processes within the honeycomb
body. One necessary precondition is for the cross-
sectional area of the holes in the inner walls which
form the cavity likewise to be at least ten times the
size of the mean passage cross-sectional area. In a
advantageous configuration of the invention, which is
important in particular for honeycomb bodies with a
large number of passages per unit cross-sectional area,
the largest cross-sectional area of the spherical free
space amounts to 20 to 100 times, preferably 30 to
50 times, the mean cross-sectional area of the
passages. This gives rise to cavities which are huge in
relation to the passage sizes and in which swirling and
cross-flows can form in particular in the case of a
pulsating gas stream, which can lead to better
conversion properties without excessive pressure loss.
It is actually advantageous if a large number of
passages, for example 10 to 500 passages, open out into
one cavity and lead out of it again.
To enable the favorable properties of the cavities
according to the invention to have an effect on as much
of the flow as possible in a honeycomb body, 50 to 100%
of the passages of the honeycomb body should intersect
at least one, preferably more than three, of the
cavities. For stability reasons, it may be necessary
for the cavities in a honeycomb body not to extend all
the way to the outermost lateral surface, which means
that under certain circumstances not all of the
passages will intersect a cavity. Preferably, however,


as many of the passages as possible should intersect
one or preferably more of the cavities, in order to
make use of their favorable properties.
It is to this end advantageous for the cavities to be
distributed uniformly over the volume of the honeycomb
body.
However, it does not present any difficulties either,
and depending on the flow properties in an exhaust gas
purification system it may be advantageous, to provide
a nonuniform distribution, preferably with an
accumulation in an inner region and/or in the direction
of the entry surface or exit surface of the honeycomb
body. This provides the option of adapting the
invention to different applications.
Depending on the way in the which the cavities are
introduced into a honeycomb body, the cavities
themselves of course are not spherical. The spherical
hollow space serves merely to provide a theoretical
description of the dimensional conditions in a cavity.
Cavities which actually occur tend to be in the form of
cylinders or curved cylinders, in which case their
axial extent preferably lies approximately
perpendicular to the profile of the passages.
The description of the invention which has been given
thus far is not restricted to honeycomb bodies made
from sheet-metal layers, but rather can also be applied
to ceramic honeycomb bodies, provided that suitable
processes are used to produce the cavities. When
producing ceramic honeycomb bodies, it is possible, for
example, for the blanks to be machined relatively
easily prior to firing, and for cavities to be produced
by punching or measures undertaken even as early as
during extrusion.


The independent claim 8 is directed specifically at
honeycomb bodies which are wound, twisted and/or
layered from metal sheets. A honeycomb body of this
type has a multiplicity of at least partially
structured sheet-metal layers, the structuring of which
forms passages which lead from an entry surface to an
exit surface of the honeycomb body. The term sheet-
metal layers is to be understood as meaning the
successive layers of the honeycomb body, irrespective
of whether these sheet-metal layers comprise one or
more separate metal sheets. It should be noted that it
is in principle possible to construct a honeycomb body
from just a single metal sheet, by part of the sheet-
metal strip being corrugated and the remaining smooth
part of the sheet-metal strip being folded onto the
corrugated part by bending. The structure formed in
this way can be wound helically, starting from the
bending line, to form a honeycomb body. The next option
is to use one smooth metal sheet and one corrugated
metal sheet to produce a helically wound honeycomb
Ibody. Multiple-start spirals formed from three or more
metal sheets are also possible. Finally, there is a
large number of forms which are produced from one or
more stacks of alternating smooth and corrugated metal
sheets. Honeycomb bodies of this type include a
multiplicity of metal sheets, although the number of
metal sheets and the number of successive sheet-metal
layers need not necessarily be identical. For this
reason, a fundamental distinction can be drawn between
a metal sheet and a sheet-metal layer, even if this is
often not possible for example in drawings which show
only part of a honeycomb body. For the present
invention, the structural form in a first approximation
plays no role, in which context it is easier, for
honeycomb bodies of helical construction, to calculate
the position of the holes to form cavities than for
honeycomb bodies constructed from a large number of
individual metal sheets. However, none of the


structural forms present fundamental problems. A
honeycomb body according to the invention is
characterized in that at least in a subregion of the
honeycomb body the sheet-metal layers have holes v/ith
an effective cross-sectional area which is greater than
10 times the mean cross-sectional area of the passages
in the respective subregion, the holes being arranged
and shaped in such a way that in the honeycomb body
they form, together with holes of adjacent sheet-metal
layers, cohesive, large-volume cavities as a result of
holes in at least 5 successive sheet-metal layers
overlapping one another, the overlap area of the
respective holes in all these 5 sheet-metal layers
being at least 10 times the mean cross-sectional area
of the passages in the subregion. As will be explained
in more detail with reference to the drawing, some
cavities are always formed in honeycomb bodies made
from perforated sheet-metal layers; in extreme
situations, it is even possible for all the cavities to
be connected to one another, which occurs whenever the
surface area of the holes in each sheet-metal layer is
larger than the remaining surface area of the sheet-
metal layer. In the case of corrugated sheet-metal
layers, the term effective surface area is used, and
this is established by projecting the hole in a sheet-
metal layer onto the center plane of the corrugated
sheet-metal layer.
In the context of the present invention, it is
important that the holes do not form small, branched
hollow spaces in the honeycomb body, but rather form
relatively large-volume cavities, which occurs
specifically if holes in adjacent sheet-metal layers
are virtually aligned with one another or overlap over
a large area. The arrangement according to the
invention in turn leads to cavities having the desired
properties. The shape of the holes can in principle be
selected as desired, although it is recommended for

mechanical reasons to select holes with rounded edges
in order to avoid the formation of cracks; moreover,
the holes should connect in each case three or more
passages to one another transversely to the direction
of flow. The holes should also have a certain minimum
size in the direction of flow, namely at least double,
preferably more than triple, the mean hydraulic
diameter of the passages which open out into the
cavity. The hydraulic diameter results from the cross-
sectional area of a passage and its cross-sectional
shape and except in the case of round passages is
smaller than the maximum width of a passage.
In a preferred embodiment of the invention, the
honeycomb body is cylindrical and is formed from one or
more stacks of metal sheets, the metal sheets of each
stack having a length L and a width B, where L is
greater than B, and the metal sheets of each stack each
having a large number of holes, the distances between
which are substantially constant on all the metal
sheets of a stack in the direction of the width B, but
are different in the direction of the length L.
Precisely this is not the case in known forms of the
prior art. To simplify production and on account of the
absence of knowledge of the invention, perforated metal
sheets were typically provided with holes uniformly
over their entire length, which specifically cannot
lead to a honeycomb body according to the invention,
either when helically winding sheet-metal layers or
when producing a honeycomb body from one or more sheet-
metal stacks.
Another preferred exemplary embodiment of the invention
is a honeycomb body formed by at least one metal sheet
of a length L and a width B, where L is greater than B,
the honeycomb body being wound helically, and the at
least one metal sheet having a large number of holes
which have approximately constant distances between


them in the direction of the width but have different
distances between them in the direction of the length.
The precise pattern of the holes depends on the
respective conditions of use. A common factor of all
wound honeycomb bodies, however, is that approximately
constant distances between the holes are expediently
required in the direction of the width of the metal
sheets used. In this way, the holes are already aligned
with one another in the direction of flow for
production reasons, without particular attention having
to be paid to these distances. Only the distance
between the holes in the longitudinal direction of each
metal sheet need be correctly calculated. In this case,
cavities can be deliberately bounded by leaving out
individual holes at certain intervals, for example, or
more cavities per revolution of a sheet-metal layer can
be provided for example in the outer region of a
honeycomb body than in the interior of the honeycomb
body by changing the pattern of holes.
To compensate for certain manufacturing tolerances, it
may be advantageous for the holes to be configured as
elongate slots, in which case their extent transversely
to the direction of the passages should be greater than
in the direction of the passages.
In their interior, honeycomb bodies according to the
invention may additionally be provided with further
structures in the metal sheets. All known measures for
influencing the flow in the interior of a honeycomb
body can be implemented in addition to the measures
according to the invention described here. The
attachment within a housing and, for example, the
formation of conical forms may also take place in
accordance with the measures known from the prior art.
A honeycomb body according to the invention is suitable
in particular as part of an exhaust-gas purification

system of an internal combustion engine, in particular
a diesel engine. A general preferred application area
is the purification of exhaust gases in motor vehicles.
The invention and its exemplary embodiments are
explained in more detail below with reference to the
drawing in which:
Fig. 1: diagrammatically depicts how a honeycomb body
according to the invention is built up from
perforated sheet-metal layers, and
Fig. 2: diagrammatically depicts a cross section
through the region of a cavity in a honeycomb
body according to the invention.
Fig. 1 shows a honeycomb body 1 which can be produced,
for example, in helical form from one smooth metal
sheet 2 and one corrugated metal sheet 3. The honeycomb
body 1, the production of which has not yet been
completed in the figure, has passages 4 which are
formed by the structure of the corrugated metal sheet 3
and lead from an entry surfaces to an exit surface6 of
the honeycomb body. An exhaust gas that is to be
purified can flow through the honeycomb body 1 in the
direction of flow S. The smooth metal sheet 2 has a
width B and length L and is provided with a large
number of holes 7. In the present example, these are
elongate slots with their longest extent in the
direction of the length L of the smooth metal sheet 2,
i.e. transversely to the subsequent direction of flow
S. The corrugated metal sheet 3 also has numerous holes
8, which in the present case are likewise designed as
elongate slots running in the same direction. It can be
seen that the holes 8 in the corrugated sheet-metal
layer 3, when the sheet-metal layer is stretched out,
must be considerably longer than the holes 7 in the
smooth metal sheet, so that the dimensions of the holes


8 in the corrugated metal sheet 3 in the corrugated
state approximately correspond to the dimensions of the
holes 7 in the smooth metal sheet 2. For the purposes
of the present invention, only the projection of the
holes 8 in the corrugated metal sheet 3 onto the center
plane of the corrugated metal sheet 3 is of importance.
The distances between the holes 7, 8 with respect to
the width B of the metal sheets 2, 3 are substantially
constant, so that in this direction holes of adjacent
sheet-metal layers always virtually completely overlap
one another. However, it can be seen that if the holes
7, 8 are at the same distances from one another in the
direction of the length L of the metal sheets 2, 3 as
well, an offset between the holes would always ensue
when the metal sheets are wound up as the diameter of
the honeycomb body 1 to be wound increases. To achieve
large cavities having the properties according to the
invention, therefore, the distance between the holes 7,
8 has to be adapted accordingly in the direction of the
length L of the metal sheets 2, 3. The simplest option
is to define before production where cavities of what
dimensions are to be present in the honeycomb body, and
then to establish what shape of holes are to be
arranged at what positions in the metal sheets 2, 3.
This operation may be of different complexity for
different forms of honeycomb bodies, but can be managed
without problems by simple tests and suitable control
of the machines which produce the holes 7, 8. The holes
1, 8 in Fig. 1 are not necessarily to be regarded as
having been drawn to scale, which means that according
to the invention they could also be considerably
larger.
Fig. 2 diagrammatically depicts a cross section through
a honeycomb body in the region of a cavity 9 according
to the invention. Smooth sheet-metal layers 2 and
corrugated sheet-metal layers 3 are stacked on top of
one another with holes in the sheet-metal layers 2, 3


substantially overlapping one another, thereby forming
a free cavity 9. This cavity 9 contains a spherical
free space 10 with a maximum cross-sectional area Qmax,
into which, therefore, a sphere of this diameter would
theoretically fit. The maximum cross-sectional area
Qmax of a sphere is to be understood as meaning the
largest cross section of this sphere. As is also
indicated by hatching in the drawing, each of the
individual passages 4 has a cross-sectional area q,
which in the present example is approximately equal for
all the passages. However, there are also forms of
honeycomb bodies in which different passage cross
sections occur. In this case, it is easy to calculate a
mean passage cross section q. The crucial factor in the
present invention is for the cavities 9 to be
sufficiently large and shaped in such a way that a
spherical free space 10 whose largest cross-sectional
area Qmax is at least ten times as large as the mean
passage cross section q fits into them. Embodiments in
which spherical free spaces of even a significantly
larger ratio fit into the cavities 9 are preferred, in
particular for honeycomb bodies with large cell
densities of, for example, 60 0 cpsi (cells per square
inch) to over 1200 cpsi.
The present invention makes it possible to further
improve the properties of highly developed honeycomb
bodies for exhaust-gas purification systems, in
particular with a view to improved removal of
particulates from an exhaust gas combined, at the same
time, with favorable properties in terms of pressure
loss, use of material and flow properties.


List of designations:
1 honeycomb body
2 substantially smooth sheet-metal layer (smooth
metal sheet)
3 corrugated sheet-metal layer (corrugated metal
sheet)
4 passage
5 entry surface
6 exit surface
7 hole in the smooth metal sheet
8 hole in the corrugated metal sheet
9 cavity
10 largest spherical free space
B width of a metal sheet
L length of a metal sheet
AB distance between the holes in the direction of
the width B
AL distance between the holes in the direction of
the length L
S direction of flow
Qmax largest cross-sectional area
q mean passage cross-sectional area

WE CLAIM
1. A honeycomb (1) with internal cavities in particular for purifying exhaust gas
from an internal combustion engine, having inner walls (2, 3) which define
passages (4) which lead from an entry surface (5) to an exit surface (6) of the
honeycomb body (1), characterized in that at least in a subregion of the
honeycomb body (1) there is a plurality of cavities (9) which are free of inner
walls (2, 3) and are shaped and dimensioned in such a way that they each
contain at least one spherical free space (10), the largest cross-sectional area
(Qmax) of which amounts to at least 10 times the mean cross-sectional area
(q) of the passages (4) in the respective subregion (T).
2. The honeycomb body (1) as claimed in claim 1, wherein the largest cross-
sectional area (Qmax) of the spherical free space (10) amounts to 20 to 100
times, preferably 30 to 50 times, the mean cross-sectional area (q) of the
passages (4).
3. The honeycomb body (1) as claimed in claim 1 or 2, wherein the cavities (9)
each intersect from 10 to 500 passages (4).

4. The honeycomb body (1) as claimed in one of the preceding claims, wherein
from 50 to 100% of the passages (4) of the honeycomb body (1) preferably
intersect at least one, preferably more than three, of the cavities (9).
5. The honeycomb body (1) as claimed in one of the preceding claims, wherein
the cavities (9) are distributed uniformly over the volume of the honeycomb
body.
6. The honeycomb body (1) as claimed in one of claims 1 to 4, wherein the
cavities (9) are distributed nonuniformly within the honeycomb body (1),
preferably with an accumulation in an inner region and / or in the direction of
the entry surface (5) or exit surface (6) of the honeycomb body (1).
7. The honeycomb body (1) as claimed in one of the preceding claims, wherein
the cavities (9) are approximately in the form of cylinders or curved cylinders,
preferably with their axial extent approximately perpendicular to the profile of
the passages (4).

8. The honeycomb body (1) as claimed in claim 1, wherein the honeycomb body
(1) is cylindrical and is formed from one or more stacks of metal sheets, the
metal sheets of each stack having a length (L) and a width (B), where L > B,
and the metal sheets of each stack each having a large number of holes (7,
8), the distances (AB, AL) between which are substantially constant on all the
metal sheets of a stack in the direction of the width (B), but are different in
the direction of the length (L).
9. The honeycomb body (1) as claimed in claim 1, wherein the honeycomb body
(1) is wound helically from at least one metal sheet (2, 3) of a length (L) and
a width (B), where L > B, the at least one metal sheet (2, 3) having a large
number of holes (7, 8) which have approximately constant distances (AB)
between them in the direction of the width (B) but have different distances
(AL) between them in the direction of the length (L).
10. The honeycomb body (1) as claimed in claim 1, wherein at least some of the
holes (7, 8) have a smaller extent in the direction of the passages (4) than
transversely to the direction of the passages (4), the holes (7, 8) preferably
being elongate slots.

11. The honeycomb body (1) as claimed in claim 1, wherein the honeycomb is a
part of an exhaust-gas purification system of an internal combustion engine, in
particular a diesel engine, and contributes to the removal of particulates from
the exhaust gas from the internal combustion engine.
12. The honeycomb body (1) as claimed in claim 1, wherein the said honeycomb
body has additional openings and / or swirl structures in the passages (4).


The invention relates to a honeycomb body (1) having inner walls (2, 3) which define
passages (4) which lead from an entry surface (5) to an exit surface (6) of the
honeycomb body (1), at least in a subregion of the honeycomb body (1) a plurality of
cavities (9) being present which are free of inner walls (2, 3) and are shaped and
dimensioned in such a way that they each contain at least one spherical free space
(10), the largest cross-sectional area (Qmax) of which amounts to atleast 10 times
the mean cross-sectional area (q) to the passages (4) in the respective subregion (T).

Documents:

02713-kolnp-2007-abstract.pdf

02713-kolnp-2007-claims.pdf

02713-kolnp-2007-correspondence others 1.1.pdf

02713-kolnp-2007-correspondence others 1.2.pdf

02713-kolnp-2007-correspondence others 1.3.pdf

02713-kolnp-2007-correspondence others.pdf

02713-kolnp-2007-description complete.pdf

02713-kolnp-2007-drawings.pdf

02713-kolnp-2007-form 1.pdf

02713-kolnp-2007-form 18.pdf

02713-kolnp-2007-form 2.pdf

02713-kolnp-2007-form 3.pdf

02713-kolnp-2007-form 5.pdf

02713-kolnp-2007-gpa.pdf

02713-kolnp-2007-international publication.pdf

02713-kolnp-2007-international search report.pdf

02713-kolnp-2007-pct request form.pdf

02713-kolnp-2007-priority document.pdf

02713-kolnp-2007-translated copy of priority document.pdf

2713-KOLNP-2007-(09-02-2012)-CORRESPONDENCE.pdf

2713-KOLNP-2007-(09-02-2012)-PA-CERTIFIED COPIES.pdf

2713-KOLNP-2007-CORRESPONDENCE 1.1.pdf

2713-kolnp-2007-correspondence.pdf

2713-kolnp-2007-examination report.pdf

2713-kolnp-2007-form 18.pdf

2713-kolnp-2007-form 3.pdf

2713-kolnp-2007-form 5.pdf

2713-KOLNP-2007-FORM-27.pdf

2713-kolnp-2007-gpa.pdf

2713-kolnp-2007-granted-abstract.pdf

2713-kolnp-2007-granted-claims.pdf

2713-kolnp-2007-granted-description (complete).pdf

2713-kolnp-2007-granted-drawings.pdf

2713-kolnp-2007-granted-form 1.pdf

2713-kolnp-2007-granted-form 2.pdf

2713-kolnp-2007-granted-specification.pdf

2713-kolnp-2007-reply to examination report.pdf

abstract-02713-kolnp-2007.jpg


Patent Number 248888
Indian Patent Application Number 2713/KOLNP/2007
PG Journal Number 36/2011
Publication Date 09-Sep-2011
Grant Date 05-Sep-2011
Date of Filing 23-Jul-2007
Name of Patentee EMITEC GESELLSCHAFT FUR EMISSIONSTE CHNOLOGIE MBH
Applicant Address HAUPTSTRASSE 128, 53797 LOHMAR
Inventors:
# Inventor's Name Inventor's Address
1 BRUCK, ROLF FROBELSTRASSE 12, 51429 BERGISCH GLADBACH
2 MAUS, WOLFGANG GUT HORST, 51429 BERGISCH GLADBACH
3 HIRTH, PETER BIRKENWEG 57, 53127 BONN
PCT International Classification Number B01J 35/04
PCT International Application Number PCT/EP2006/001449
PCT International Filing date 2006-02-17
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 102005007403.0 2005-02-18 Germany