Title of Invention

A PROCESS FOR THE RECOVERY OF USEFUL MATERIALS FROM MULTI-LAYER LAMINATED PACKAGING REFUSE

Abstract A process of recovery of useful constituents from multi-layered laminated fragments of packaging industrial refuse in sheet, tube or shredded form from each other as separate constituents comprising treating the comminuted fragments with an inorganic base solution, so as to dissolve the laminated metal aluminium to subsequent recoverable aluminium salts, eventuating primarily as sodium aluminate wherein from even a medicine like aluminium hydroxide gel passing pharmacy grade assay, and recover the polyethylene plastics in as it is physical condition and washing the same.
Full Text FIELD OF INVENTION:
The present invention relates to a process for recovery of useful constituents from
multi-layered laminated fragments of certain packaging industrial refuse. More
particularly the invention relates to a process for recovery of useful constituents
from multi-layered laminated fragments of plastics and aluminium foils.
BACKGROUND OF THE INVENTION:
To meet the respective specific and particular packaging demands use of
lamination of plastics and aluminium is a widely accepted practice in packaging
industries.
Such packaging laminates aluminium foil with plastics either in one side or in both
sides. In toiletries a particular tubes of such lamination is widely used. In medicinal
strips or blister type packs such lamination is also widely used. In cable industry to
protect cables from surrounding adversities a protective wrap-type packaging of
such lamination is also widely used. Also, the use of such laminated pouches to
pack beverages and processed foods are widely desperate.
Now, the entire manufacturing process, to reach up-to a final stage of packaging,
en route, generate a huge volume of refuse in almost every chain of production
process.
Such mass may be called in short as multi-layer laminated packaging industrial
refuse (pre- use condition) where the chief components are thin foils of metal
aluminium and polyethylene plastics.
In any convenient way these laminated stuffs are stubbornly non-recyclable and
vulnerable for destroying despite their characteristic commercial valuations.
A planned so-called Eco-friendly projects of incineration or landfill treatments
(mal-practicing Earth as an eternal burial ground of industrial refuse) are real
costly affairs as well as burden to economy, even to production of developed
countries also.


In India, almost about in coarse average, around Rupees Sixty-three Million (around US
$1.35mn) per year, or say, around Rupees One Hundred Seventy-five Thousand
(around US $3800) per day can be saved, as well as, can be earned from the recovery
of such packaging industrial laminated refuse generated industrially (that is pre-use
stage) only.
The colossal mass of domestic (post-use) refuse, where the used such whole packaging
are thrown away as garbage, again absolutely vulnerable for destroying, is enough tall to
undercount.
In India almost about in coarse average around Rupees One Thousand Five Hundred
Million (around US $ 32mn) per year or say around Rupees Four Million (around US $
85,000) per day can be saved, as well as, can be earned from the recovery of such
domestic (post-use) packaging industrial laminated refuse, obviously subject to recovery
if and when is possible.
Thus, recovery and its subsequent proper recycle/reprocess/reuse will nurture and
strengthen the main stream of economy as well as will save the ecology from
disadvantageous often carcinogenic and often susceptible ODS (ozone depleting
substances) releasing {when burn in open air as in India} environmental pollution as
well.
Since such refuse is out and out a waste, whatsoever stubborn it may be, its process of
separation and recovery should be economical. A higher recovery process if dearer the
cost of recovered material than that of the virgin would subsequently overcast the main
intention obviously.
Patent Nos. DE 4122705, WO 9304116, and EP 599905 have specific relevance to the
de-lamination of laminated packaging industrial refuse uses acetone-water as organic
chemical solvents. Acetone water is comparatively dearer than solution of sodium
hydroxide used herein. Acetone has a very low flash point and it is highly flammable and
accident-prone. The plastics are also fairly flammable. In industrial application, where
huge volume of acetone will require, its affinity to accident is unpredictably dangerous.

US Patent No. 5,246,116 relates to the de-lamination of laminated packaging
industrial refuse has used poly alkaline glycol polymer solution as solvent.
US Patent No. 5,421,526 teaches the use of volatile organic acids like formic acid,
acetic acid, propanoic acid, butyric acid as solvents.
The aforesaid prior arts use organic chemical solvents only, such as, Acetone-
water, Poly alkaline glycol polymer solution and volatile organic acids like formic
acids, acetic acids, propanoic acid and butyric acid and does not teach the use of
inorganic chemical compounds, in particular, inorganic bases.
US patents 5246116 and 5421526 further make use of heat at temperatures of 80
C and 50 C respectively. Here, the material is extremely lighter in weight and is
accordingly voluminous. In one 200lit.reactor with maximum 190lit. solvent, at one
time, maximum 15Kgs shredded material can be processed. To process ten
metric tons in a day it demands a series of big reactors and subsequent volume of
solvents. Application of heat to such a big mass is obviously a costly affair.
None of the known art provides a process for the de-lamination of laminated
packaging /industrial refuse which gives optimum economy and eco friendliness.
The applicant with a view to economize the treatment of such material proposed a
process so as to recover useful constituent from multi-layer laminated fragments
of packing industrial refuse from each other by treating the fragments with an
inorganic solution in particular, nitric acid, so as to loosen the bonding of the
constituents and recovering such constituents. The said process is covered in the
applicant's International Patent Application publication No.WO/02/50175.
The applicant has now found that recovery of laminated constituents can also be
economically effected by treating the material with an inorganic base, in particular
sodium hydroxide. The use of sodium hydroxide is found to result in substantial
economy because the organic compounds used in prior arts are relatively more
expensive. The process of the present invention is also relatively economical and

efficient than that of the applicants earlier work being WO/02/50175 also because
Sodium aluminate (NaAI02) (either conc, solution or dried powder) eventuate as a
product of the process.
Thus the primary object of the present invention is to provide an improved process
for recovery of constituents of multi-layer laminated fragments of packaging
industrial refuse / scraps / waste etc.
A further object of the present invention is to provide an alternative process for the
recovery of laminated constituents that is economical and does not involve any
expensive/sophisticated treatment.
A still further object of the present invention is to provide a process for the
recovery of the laminated constituents that is Eco-friendly.
Yet another object of the present invention is to provide a process for the recovery
of laminated constituents such that the process, at its final stage, results profitable
end products
Yet a further object of the present invention is to provide a process for the
recovery of laminated constituents such that the process is applicable even where
the lamination is mechanically stubborn or where the aluminium foil is very thin.
SUMMARY OF INVENTION:
Thus according to the present invention there is provided a process for the
recovery of useful constituents from multi-layered fragments of packaging
industrial refuse by separating them as individual constituents, the process
comprising contacting the fragments with an inorganic basic solution, so as to
recover the laminated metal aluminium as metal aluminium salt and set free the
fragments of polyethylene plastics from lamination
The metal aluminium is recovered in the form of reusable salts while the plastics
retains its physical form.


Contacting of the fragments with the inorganic basic solution is done for a period
of between 48 - 84 hours.
The recovered aluminium salt is sodium aluminate.
From such produced Sodium aluminate, Aluminium hydroxide gel [AI(OH)3] either
of commercial grade or of pharmacy grade results as other product of the metal
aluminium salt.
Also from thus obtained Aluminium hydroxide gel by adequate calcination dried
powder of Alumina (AI2O3) can be yielded as other aluminium salt. Again from
Aluminium hydroxide gel through proper chemical reaction other aluminium salts
as Aluminium sulphate [AI2(SO4)3], Aluminium nitrate [AI(NO3)3] etc. can also be
obtained.
DESCRIPTION OF PREFERRED EMBODIMENT:
According to the present invention multi-layer laminated packaging industrial
refuse laminated with plastics and thin foils of aluminium, either in one side or in
both the sides are used for recovery of plastics in as it is physical condition and
metal aluminium foils in the form of aluminium salts. The entire refuse may appear
either in sheets form, strips form, tubes form or sometimes in already shredded /
trimmings form. The reference numerals in brackets refer to figure 1.
Through conventional shredder un-shredded forms are shredded breadth-wisely
at an average 25mm to 50mm irrespective of length, but preferably not more than
1 metre (1) (figure 1). The comminuted refuse fragments are dipped in inorganic
base solvent, 2M sodium hydroxide solution at ambient temperature (2). The
mass is allowed to stand quietly under casual supervision for about 48 to 84 hours
depending upon the size of shredding.
At ambient temperature 2M sodium hydroxide solution slowly by etching dissolves
the aluminium and release the free plastics within the solution. When the
aluminium foils get totally dissolved the plastics being freed from lamination come
in a free floating condition awaiting for removal from the solution.


Fragments of recovered plastics are then removed (3) from the resultant, a very
dilute solution of Sodium aluminate (NaAIO2), and are allowed to undergo a dip
with fast stirring in dilute nitric acid solution for about 1/2 to 2 minutes (4). Then
the plastics are given sufficient water baths to wash away the adhered solvents
(5).
Fragments of recovered plastics, getting washed with water, are then centrifuged
to as far as possible dryness (6). Then they are allowed to have a sun bath or to
dry in a dryer (7) for a total drying. The dried thus recovered plastics are then
ready for producing saleable recycled plastic granules or also may be sold even
as such.
The time factor varies directly with the size of shredding. Breadth-wisely smaller
fragments will take shorter time-duration. Density of sodium hydroxide / sodium
aluminate solution monitors the span of time also. Care should be taken for tubes.
Tubes of 0.25cm breadth-wisely shredding will go easy into the reaction.
The main volume of 2M sodium hydroxide solution after such certain frequent use,
eventuate as Sodium aluminate solution, as the prime recovery of metal
aluminium salt of that metal aluminium foil the chief component of the aforesaid
multi-layer laminated packaging industrial refuse, that in due time saturates
sufficiently to discharge Aluminium hydroxide as precipitation (9). Initially the
precipitation appears in a just visible manner and then by means of effects of
series of dipping, more and more dense precipitation of Aluminium hydroxide is
discharged.
The resultant Aluminium hydroxide is collected through filtration (8). The filtrate
(11) Sodium aluminate according to density may either be used for further
dippings of such comminuted strips, or may taken for direct production of
concentrated solution of Sodium aluminate (13).
In accordance with the percentage of moisture present therein, after
centrifuged/press-filtered (10), the yielded paste of Aluminium hydroxide are


mixed with cone, sodium hydroxide solution accordingly (12) to yield concentrated
solution of Sodium aluminate (13).
Within the prepared concentrated solution of sodium aluminate (13), the already
produced concentrated sodium aluminate solution, generated in the previous phases as
filtrate (11), are mixed (13) and a final concentration by boiling is reached which is then
cooled and filtered to obtain a pure clean and clear solution of Sodium aluminate (14) at
ambient temperature.
The stubborn non-recyclable disadvantageous man-made industrial laminated refuse,
somewhere carcinogenic somewhere ODS releaser, by virtue of this present invention
having being lost their rigidity is converted to easy recyclable free plastics as well as
converted to a chemical in the form and frame of recovery, having a versatile productivity
to produce a series of metal aluminium salts including a pharmacy grade bulk drug
Aluminium hydroxide gel offering a sound commercial profit.
An adamant waste plaguing highly detrimental and awful pollution to the living Earth is
conquered to an extent to yield a medicine satisfies pharmacopoeia.
Now in thus produced concentrated solution of Sodium aluminate,[(who now itself is also
a saleable product (14)(15)] concentrated hydrochloric acid is added (16)(24) to yield
either Aluminium hydroxide gel of commercial grade (18) or Aluminium hydroxide gel of
pharmacy grade(26).
During the preparatory process of Aluminium hydroxide gel the filtrate (22)(30) we
obtained, on evaporation to dryness (23)(31) will generate dry powder of pure Sodium
chloride NaCI as a marketable by-product.
Again, to produce Aluminium hydroxide gel from such cone, solution of sodium
aluminate instead of cone, hydrochloric acid a number of inorganic as well as organic
acids may also be taken for the use, where the resultant sodium salt (here as by-
product) will only vary. E.g. Hydrochloric acid (HCI) will produce Sodium.

chloride (NaCI), Sulphuric acid (H2SO4) will produce Sodium sulphate (Na2S04),
Formic acid (HCOOH) will produce Sodium formate (HCOONa) etc.
Such obtained commercial grade Aluminium hydroxide gel conventionally if
adequately calcined would yield dried powder of Alumina (AI203)(32) which has
its own various uses and concern market.
Such obtained Aluminium hydroxide gel conventionally through proper chemical
reaction would yield other aluminium salts eg. Aluminium sulphate AI2(S04)3,
Aluminium nitrate AI(N03)3 etc.(33)
The entire process, en route, discharges absolute ZERO pollution to environments
in any means.
EXAMPLES:
The process of the invention will now be demonstrated with reference to two
working embodiments of the process.
Example -1
(A) In a 1000 ml clear conical flask 66gms of pure dried sodium hydroxide flake is
taken. Clear water is poured to make 800mls of 2M sodium hydroxide solution.
(B)Few pieces of laminated toiletry tubes are taken. The shoulder and tail-end
seal of the tubes are shredded out by manual cuttings with scissors. Then
taking 0.25 cm breadth-wisely the tubes are longitudinally shredded (1). All the
contaminants are cleared and washed out.
(C) In a sufficient quantity the 0.25 cm shredded fragments of the laminated tubes
are now dipped into that conical flask containing 800mls of 2M sodium
hydroxide solution (2). The flask is closed with a stopcock. It is now allowed to
stand for about 48 to 84 hours. In between times a six hourly stirring of the
material is preferred so as to all the parts of the fragments get contact with the
solution for reaction.
(D)The aluminium gets slowly dissolved by that time. When all aluminium get
dissolved the two free layers of plastics, being freed from lamination, start to
float within the solution.


(E) Such plastics free from aluminium lamination are taken out (3) and are given a
dip in a dilute nitric acid solution (4) for about ½ to 2 minutes with fast stirring.
Then the plastics are taken off from the nitric acid and are given sufficient
water bath to wash away all the adhered solvents (5). Plastics are then
allowed a complete drying (6)(7).
Steps (B) and (C) and (D) and (E) are repeated.
Even now, subject to the concentration of sodium aluminate the precipitation of
Aluminium hydroxide may or may not occur.
Again steps (B), (C), (D) and (E) are repeated.
Either then or in the next phase / phases precipitation of Aluminium hydroxide
occurs in a satisfactory quantity (2).
(F)By filtration (8) Aluminium hydroxide is then collected (9), either press-
filtered/centrifuged and dried to a paste/cake (10). The filtrate, that is, solution
of sodium aluminate is kept aside (11).
(G)Now, in 100ml of conc, sodium hydroxide solution about 200gms of thus dried
paste of aluminium hydroxide (10) is mixed (12) and boiled to dissolve. The
resultant solution of sodium aluminate kept aside (11) is mixed within it (13).
The entire solution is boiled, cooled and filtered to obtain a pure clean and
clear solution of Sodium aluminate (AI2o3 is in between 20—25%) at ambient
temperature (14). Now such concentrated solution of Sodium aluminate[(who
itself is also a saleable product(14)(15)]is conventionally ready to produce
either commercial grade(18),or pharmacy grade(26), Aluminium hydroxide gel
by addition of necessary concentrated hydrochloric acid accordingly.
(H)Such produced commercial grade Aluminium hydroxide gel conventionally if
i
properly calcined would yield dried powder of Alumina (32) while again
conventionally if properly chemically reacted would yield other salts of metal
aluminium E.g. Aluminium sulphate, Aluminium nitrate etc. (33) as well.
(I) In one part of such sodium aluminate solution concentrated hydrochloric acid
is mixed (16) to yield Aluminium hydroxide gel, commercial grade (18). The gel


is then centrifuged (19), washed and re-dried (20) to a paste. Thus generated paste
could be dried (21) to produce dried powder of Aluminium hydroxide gel of commercial
grade.
(J) In the other part of such sodium aluminate solution, in accordance with the assay of
aluminium oxide (AI203) present within, the solution is given accordingly dilution and
after that concentrated hydrochloric acid is mixed (24) to yield Aluminium hydroxide gel
(26) satisfying pharmacy grade assay. It is then centrifuged/press-filtered (27), washed
with sufficient boiled/sterilized water and again re-dried (28) to a paste. Half of it is then
preserved (by addition of sodium benzoate) and packed as paste of Aluminium
hydroxide gel as per pharmacy specification.
(K) To get dried powder of Aluminium hydroxide gel of pharmacy grade the other half of
the yielded gel in paste form is dried(29), pulverized (if necessary) and packed as per
pharmacy specification.
(L) Here the obtained filtrate (22) (30) by evaporation to dryness (23)(31) will yield also
pure Sodium chloride (NaCI), as a by-product, which has its own specific market.
Thus, by using a pure inorganic base sodium hydroxide, separation and recovery of
laminated fragments of multi-layer laminated packaging industrial refuse is possible
where free plastic fragments are recovered in as it is physical condition in one part and
the recovery of metal aluminium primarily achieving in the form of metal salts like
Sodium aluminate (14) (15) or from such resultant sodium aluminate solution Aluminate
hydroxide gel (as both paste and derived powder), either in commercial grade (20)(21)
or/and in pharmacy grade (28)(29) are achieved, again where also from such alumimium
salts E.g. Aluminium sulphate, Aluminium nitrate (33) or even Alumina (32) are achieved
depending upon just planning and specific procedure and motto in the other part.
Thus a disadvantageous laminated refuse stuff can be converted to a use of benefit
even as a medicine satisfying pharmacopoeia.


EXAMPLE-2
(A) In a 200lit. clear polythene drum 15kgs. of pure dried sodium hydroxide flake
is taken. Then clear water is poured to produce 180lits. of 2 M sodium
hydroxide solution.
(B) Around 10kgs. of multi-layer laminated packaging industrial refuse is taken. If
the lot is un-shredded then either mechanical or manual shredding breadth-
wise @ 0.25cm - 0.5cm and length-wisely @1 metre is done, if necessary (1).
All the contaminates are cleared and washed out.
(C) Cleared such comminuted fragments of refuse are now dipped into the drum
containing 180 lit. 2 M sodium hydroxide solution (2). After covering the drum it
is allowed to stand for 48-84 hours. In between times a six hourly stirring of the
material is preferred so as to all the parts of the fragments get contact with the
solution for reaction.
(D)The aluminium gets slowly dissolved by that time. When all the aluminium get
dissolved the free layers of plastics, being freed from lamination, start to float
within the solutions.
(E) Such plastics free from aluminium lamination are taken out (3) and are given a
dip into a dilute nitric acid solution (4) for about 1/2 -2 minutes with fast stirring.
Then the plastics are taken off from the nitric acid solution and are given
sufficient water bath to wash away all the adhered solvents (5). The plastics
are then allowed a complete drying (6)(7).
Steps (B) and (C) and (D) and (E) are repeated.

Even now, subject to the concentration of sodium aluminate the precipitation of
aluminium hydroxide may or may not occur.
Again steps (B), (C), (D) and (E) are repeated.
Either then or in the next phase / phases precipitation of aluminium hydroxide
occurs in a satisfactory quantity (2).
(F)By filtration (8) Aluminium hydroxide is then collected (9), either
centrifuged/filter-pressed and dried to a paste/cake (10). The filtrate, that is,
solution of sodium aluminate is kept aside (11).


(G)Now in 3lit. of cone, sodium hydroxide solution 6kgs of such dried paste / cake
of Aluminium hydroxide(10) are mixed (12) and boiled to dissolve. The
resultant solution of sodium aluminate kept aside (11) is mixed within it (13).
The entire solution is boiled, cooled and filtered to obtain a pure clean and
clear solution of Sodium aluminate (AI203 is in between 20—25%) at ambient
temperature (14). Now such concentrated solution of Sodium aluminate [(who
itself is also a saleable product (14)(15)] is ready to produce conventionally
either commercial grade (18), or pharmacy grade (26) aluminium hydroxide gel
by addition of necessary concentrated hydrochloric acid accordingly.
(H)Such produced commercial grade Aluminium hydroxide gel if conventionally
properly calcined would yield dried powder of Alumina (32) while again if
conventionally properly chemically reacted would yield other salts of metal
aluminium E.g. Aluminium sulphate, Aluminium nitrate etc. (33) as well.
(I) In one part of such sodium aluminate solution concentrated hydrochloric acid
is mixed (16) to yield Aluminium hydroxide gel, commercial grade (18). The gel
is then centrifuged (19), washed and re-dried (20) to a paste. Thus generated
paste could be dried (21) to produce dried powder of Aluminium hydroxide gel
of commercial grade.
(J) In the other part of such sodium aluminate solution, in accordance with the
assay of aluminium oxide (AI203) present within, the solution is given
accordingly dilution and after that concentrated hydrochloric acid is mixed (24)
to yield Aluminium hydroxide gel (26) satisfying pharmacy grade assay. It is
then centrifuged/press-filtered (27), washed with sufficient boiled / sterilized
water and again re-dried (28) to a paste. Half of it is then preserved (by
addition of sodium benzoate) and packed as paste of Aluminium hydroxide gel
, as per pharmacy specification.
(K)To get dried powder of Aluminium hydroxide gel pharmacy grade the other half
of the yielded gel in paste form is dried (29), pulverized (if necessary) and
packed as per pharmacy specification.
(L) Here the filtrate obtained(22)(30), by evaporation to dryness(23)(31), will yield
also pure Sodium chloride (NaCI), as a by-product, which has its own specific
market

Thus by using a pure inorganic base sodium hydroxide, separation and recovery of
laminated fragments of multi-layer laminated packaging industrial refuse is possible
where free plastic fragments are recovered in as it is physical condition in one part and
the recovery of metal aluminium achieving in the form of metal salts like Sodium
aluminate (14)(15) or from such resultant sodium aluminate solution Aluminium
hydroxide gel (as both paste and dried powder), either of commercial grade (20)(21),
or/and of pharmacy grade (28)(29) are achieved, again where also from such obtained
commercial Aluminium hydroxide gel production of other aluminium salts E.g. Aluminium
sulphate, Aluminium nitrate etc.(33) or even Alumina (32) are achieved depending upon
just planning, specific procedure and motto in the other part.
Thus a disadvantageous laminated refuse stuff can be converted to a use of benefit
even as a medicine satisfying pharmacopoeia.


I CLAIM:
1. A process for the recovery of useful constituents from multi-layered fragments
of packaging refuse by separating the layering materials essentially
constituting of aluminium or aluminium based material and plastic material as
individual constituents, the process comprising contacting the fragments with
an inorganic base so as to recover aluminium as metal aluminium salt and
release the fragments of plastic material from lamination;
2. A process as claimed in claim 1 wherein the inorganic base is sodium
hydroxide in solution.
3. A process as claimed in claim 6 wherein the concentration of the said sodium
hydroxide solution is 2M.
4. A process as claimed in claim 1 wherein the said recovered aluminium salt is
sodium aluminate.
5. A process as claimed in claim 1 wherein the said fragments are contacted with
the said basic solution for a period of 48 - 84 hours.
6. A process as claimed in claim 1 wherein the said plastic is polyethylene.
7. A process as claimed in claim 1, wherein the multi-layer laminated packaging
industrial refuse is in sheet, strips, tube or shredded / trimming form.
8. A process as claimed in anyone of the preceding claims wherein any un-
shredded forms of the refuse are shredded using a conventional industrial
shredder to a size of about 0.25cm - 0.5cm in breadth and about 0.5—
1.5metre in length.
9. A process as claimed in any one of the preceding claims wherein the refuse is
contacted with the sodium hydroxide solution by dipping.

10. A process as claimed in any one of the preceding claims wherein the plastics,
after being freed from lamination, is contacted with dilute nitric acid followed by
one or more water baths for total removal of adhered solvents from the
recovered plastics.
11.A process as claimed in any one of the preceding claims wherein the
separated plastics are subject to a step of drying.
12. A process as claimed in any one of the preceding claims wherein the
separated aluminium salts are dried if desired.
13. A process as claimed in any one of the preceding claims, wherein the drying is
effected by conventional centrifuge / press-filter optionally followed by drying
under the sun, or in conventional tray-dryer or spray-dryer.


A process of recovery of useful constituents from multi-layered laminated
fragments of packaging industrial refuse in sheet, tube or shredded form from
each other as separate constituents comprising treating the comminuted
fragments with an inorganic base solution, so as to dissolve the laminated metal
aluminium to subsequent recoverable aluminium salts, eventuating primarily as
sodium aluminate wherein from even a medicine like aluminium hydroxide gel
passing pharmacy grade assay, and recover the polyethylene plastics in as it is
physical condition and washing the same.

Documents:

572-cal-2002-abstract.pdf

572-cal-2002-claims.pdf

572-CAL-2002-CORRESPONDENCE 1.2.pdf

572-CAL-2002-CORRESPONDENCE 1.3.pdf

572-CAL-2002-CORRESPONDENCE-1.1.pdf

572-cal-2002-correspondence-1.4.pdf

572-CAL-2002-CORRESPONDENCE.pdf

572-cal-2002-description (complete).pdf

572-cal-2002-drawings.pdf

572-cal-2002-examination report-1.1.pdf

572-cal-2002-examination report.pdf

572-cal-2002-form 1.pdf

572-cal-2002-form 18-1.1.pdf

572-cal-2002-form 18.pdf

572-cal-2002-form 2.pdf

572-cal-2002-form 3-1.1.pdf

572-cal-2002-form 3.pdf

572-CAL-2002-FORM-27.pdf

572-cal-2002-granted-abstract 1.1.pdf

572-cal-2002-granted-abstract.pdf

572-cal-2002-granted-claims.pdf

572-cal-2002-granted-description (complete).pdf

572-cal-2002-granted-drawings.pdf

572-cal-2002-granted-form 1.pdf

572-cal-2002-granted-form 2.pdf

572-cal-2002-granted-specification.pdf

572-cal-2002-pa.pdf

572-cal-2002-reply to examination report-1.1.pdf

572-cal-2002-reply to examination report.pdf

572-cal-2002-specification.pdf


Patent Number 247577
Indian Patent Application Number 572/CAL/2002
PG Journal Number 17/2011
Publication Date 29-Apr-2011
Grant Date 25-Apr-2011
Date of Filing 04-Oct-2002
Name of Patentee ASHUTOSH MUKHOPADHYAY
Applicant Address C/O PROF. MANAB GANGOPADHYAY, 192/15A, ROY BAHADUR ROAD, KOLKATA
Inventors:
# Inventor's Name Inventor's Address
1 MUKHOPADHYAY ASHUTOSH C/O PROF. MANAB GANGOPADHYAY, 192/15A, ROY BAHADUR ROAD, KOLKATA - 700 053
PCT International Classification Number C08J 11/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA