Title of Invention

PROCESS FOR THE PRODUCTION OF THIN LAYERS OF SILICONE, THIN SILICONE AND USE

Abstract Process for the production of thin layers of extrudable silicone, where the silicone layer is extruded. In this context, the silicone layer can be extruded to a substrate layer or the silicone layer and the substrate layer can be extruded from an extrusion die together.
Full Text FORM 2
THE PATENT ACT 1970 (39 of 1970)
&
The Patents Rules, 2003 COMPLETE SPECIFICATION ,
(See Section 10, and rule 13)
1. TITLE OF INVENTION
PROCESS FOR THE PRODUCTION OF THIN LAYERS OF SILICONE, THIN SILICONE AND USE
2. APPLICANT (S)
a) Name : HUHTAMAKI FORCHHEIM ZWEIGNIEDERLASSUNG DER
HUHTAMAKI DEUTSCHLAND GMBH & CO., KG
b) Nationality : GERMAN Company
c) Address : ZWEIBRUECKENSTRASSE 15-25
D-91301'FORCHHEIM, GERMANY
3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed : -

Description
Process for the production of thin layers of silicone, thin silicone and use
The invention relates to a process for the production of thin layers of silicone, the thin silicone layer produced by this process and the use of the thin silicone layer.
Many different silicone coatings have been disclosed that can be used thinly and sparingly, but all of them have the disadvantage that they have to be applied to a substrate laboriously in an additional operation.
The purpose of the invention is to propose a process for the production of thin layers of silicone that can be carried out in a single, simple operation.
In the solution to this problem proposed by the invention, the silicone layer is extruded.
It has proved to be extremely advantageous in this context if the silicone layer is extruded onto a substrate layer.
It is also very advantageous if the silicone layer and the substrate layer are extruded together out of an extrusion die.
A silicone layer can be produced very simply and quickly in this way.
It has also proved to be very advantageous if in accordance with the invention the substrate layer is added after the silicone layer has been extruded.
In another very advantageous further development of the invention, the silicone layer is covered by a lop layer.
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The silicone layer is protected against damage by the top layer.
In this context, it has also proved to be very advantageous if the top layer is added after the silicone layer has been extruded.
It has also proved to be extremely advantageous if the top layer is extruded together with the silicone layer.
The top layer is produced in a single operation together with the silicone layer as a result.
In another very advantageous further development of the invention, a tie layer is incorporated between the substrate layer and the silicone layer.
It has also proved to be very advantageous if a tie layer is incorporated between the top layer and the silicone layer.
An effective bond between the layers is guaranteed by this.
It is extremely advantageous if the tie layer is extruded together with the silicone layer.
It is also very advantageous if the tie layer is extruded together with the top layer or the substrate layer.
In another very advantageous further development of the invention, the tie layer is applied to the silicone layer after the latter has already been extruded.
It is also very advantageous if the tie layer is applied to the top layer and / or substrate layer after the latter have already been extruded.
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It has also proved to be very advantageous if in accordance with the invention a complete multilayer combination consisting of a substrate layer, a silicone layer and a top layer is coextruded.
In another very advantageous further development of the invention, a tie layer provided between the silicone layer and the substrate layer and / or lop layer is coextruded together with the other layers.
A multilayer combination can be produced inexpensively in just one operation in this way,
It has also proved to be extremely advantageous if in accordance with the invention the combination of the substrate layer and the silicone layer is oriented.
This on the one hand changes the properties of the silicone layer and on the other hand reduces the thickness of the silicone layer.
It has also proved to be extremely advantageous in this context if the combination of the substrate layer, silicone layer and top layer is oriented.
Any cracking or tearing of the silicone layer during the orientation operation is avoided effectively as a result. The silicone layer is still protected after the orientation operation too.
It has also proved to be very advantageous If in accordance with the invention at least the substrate layer and / or top layer is pulled off after extrusion and / or orientation.
A film siliconised on one side or a purely silicone layer is produced in this way.
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It is also very advantageous if in accordance with the invention the finished silicone layer is wound up.
This makes it particularly easy to store and transport the finished silicone layer.
It has proved to be very advantageous in this context if a top layer or a substrate layer is provided between two layers of the silicone layer.
It is avoided in this way that two layers of the silicone layer slick together.
Very advantageous thin, extruded silicone in accordance with a further development of the invention produced by a process in accordance with the invention is involved when a thermoplastic silicone elastomer is provided.
A thermoplastic silicone elastomer can be extruded particularly well.
It has proved to be very advantageous in this context if a thermoplastic material,
particularly a thermoplastic film, is provided as the substrate layer and / or top layer.
It is also very advantageous if polyethylene, particularly LDPE or LLDPE, is provided as the thermoplastic material.
In accordance with another further development of the invention, it has also proved to be very advantageous if polypropylene, particularly polypropylene homopolymers and polypropylene copolymers, is provided as the thermoplastic material.
It is also very advantageous if a blend of different materials is provided as the substrate layer and / or top layer.
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Thermoplastic materials are a particularly suitable choice as the substrate layer and / or top layer because of their properties.
In another very advantageous further development of the invention/ ethylene acrylate copolymers, ethylene vinyl acetate copolymers, acid copolymers or ionomers are used as tie layers.
It is also very advantageous in this context if the tie layers consist of blends that contain ethylene acrylate copolymers, ethylene vinyl acetate copolymers, acid copolymers and / or ionomers at least to some extent.
It has also proved to be very advantageous if ethylene vinyl acetate copolymers are provided as tie layers, where the copolymers preferably account for more than 5%. Thanks to these tie layers, the bond between the silicone layer and the other layers can be adapted within a wide range.
In accordance with another further development of the invention, it has proved to be very advantageous if the substrate layer is between 5 and 3 000 um thick before orientation, is in particular between 10 and 500 um thick and is preferably between 10 and 200 um thick.
It has also proved to be very advantageous if in accordance with the invention the top layer is between 5 and 3 000 um thick before orientation, is in particular between 10 and 500 um thick and is preferably between 10 and 200 um thick.
It is also very advantageous if the thermoplastic silicone elastomer is between 1 and 3 000 um thick, is in particular between 1 and 70 thick, is in particular between 1 and 30 um thick and is very particularly between 5 and 20 μm thick.
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In another very advantageous further development of the invention, more than 90% of the thermoplastic silicone elastomer is preferably accounted for by an organic silicone component.
The silicone component is essentially responsible for the release properties of the silicone elastomer. Good release properties are guaranteed by the large proportion of the elastomer accounted for by the silicone component.
It has also proved to be very advantageous if the silicone elastomer has a release force in relation to adhesives, particularly in relation to pressure-sensitive adhesives, of between 1 and 700 cN/cm, preferably between 5 and 100 cN/cm.
This guarantees a wide range of different applications for the silicone elastomer as a release material.
It is also very advantageous if the silicone elastomer has a melt viscosity of between 10 000 and 100 000, in particular between 35 000 and 45 000 Pas.
This makes it possible to extrude the silicone elastomer very effectively.
It has also proved to be very advantageous if in accordance with the invention the silicone elastomer has a Shore hardness level of between 10 and 100 and in particular between 50 and 60.
In another very advantageous further development of the invention, the reduction in adhesive force in accordance with FINAT 11 of a pressure-sensitive adhesive due to the silicone elastomer is This means that the adhesive force of a pressure-sensitive adhesive is influenced as little as possible during storage.
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It has also proved to be very advantageous if the thickness of the silicone elastomer layer amounts to between 1 and 400 urn after orientation, is in particular between 1 and 50 μm and is preferably between 1 and 5 μm.
In another very advantageous application for thin silicone in accordance with the invention/ a combination of a silicone layer and a top layer and / or substrate layer is used to produce, cover or line an object provided with a silicone layer, in particular a pack or a container.
The inside of the container is, for example, prepared to hold pressure-sensitive adhesives in this way.
It has proved to be very advantageous in this context if the silicone layer is laminated
to a basic material, where the substrate or top layer is facing away from the basic material,
and is then thermoformed together with the basic material to produce a container.
It has also proved to be very advantageous if the combination of a substrate layer, a silicone layer and a top layer is applied to a basic material together and is then thermoformed together with the basic material to produce a container.
It is very advantageous in this context if the combination of a substrate layer, a silicone layer and a top layer is thermoformed together to produce a container.
It has proved to be extremely advantageous if the substrate layer or the top layer is pulled off after the container has been completed.
The bonding of the silicone layer to the substrate layer stops the silicone layer from tearing during thermoforming. This effect is reinforced by the lop layer. The top layer also
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stops the silicone layer being damaged at all when the unfilled containers are produced and transported.
In accordance with another further development of the invention, it is also very advantageous if the silicone layer forms a highly transparent protective layer for the object that preferably resists weathering.
It is also very advantageous if the silicone layer forms a protective layer for the object that repels dirt.
An object etc. can be protected against numerous environmental influences as a result.
In another very advantageous further development of the invention, the silicone layer is used as a protective layer on particularly smooth surfaces.
It is very advantageous in this context if the silicone layer is bonded to particularly smooth surfaces by adhesion.
Applications for the silicone layer as protective layers that can be pulled off and / or replaced are possible as a result.
It has also proved to be advantageous in accordance with another further development of the invention if the silicone layer is used as a release layer in patterns of any kind.
Applications for the silicone layer possibly in connection with further layers that are designed to separate several layers of an object are feasible as a result of this, for example.
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It is extremely advantageous if in accordance with another further development of the invention the silicone layer is used in hygiene applications, particularly in hygiene packaging etc.
This guarantees that such packs etc. can be produced very simply.
In another very advantageous application of the invention, the silicone layer is used as an intermediate layer between several layers of a window pane.
Panes of safety glass can then, for example, be produced with an intermediate layer with the silicone layer according to the invention.
It has also proved to be extremely advantageous if the silicone layer is produced in combination with further layers and forms a window pane etc. together with these layers.
This makes it possible to manufacture window panes, spare panes etc. in a single operation too.
Several embodiments of the invention are illustrated in the drawings.
Fig. 1 shows a three-layer coextrudate,
Fig. 2 shows a five-layer coextrudate and
Fig. 3 shows a thermoformed container that contains part of the coextrudate.
In a first example, a three-layer coextrudate 1 is extruded from a die. This coextrudate 1 consists of a substrate layer 2 made from a thermoplastic material, next to which is a
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silicone layer 3 made from a thermoplastic silicone elastomer. The silicone elaslomer is followed by a top layer 4 that is also made from a thermoplastic material.
The thermoplastic material can be polyethylene, e.g. LDPR or LLDPE, polypropylene etc, or a blend of different materials.
After it has been extruded, the coextrudate can be oriented longitudinally and / or transversely, as a result of which on the one hand the strength properties of the individual layers arc improved and on the other hand the thickness of the layers is reduced. The substrate layer 2 and the Lop layer 4 can each be between 10 and 500 μm thick in the extrusion process. The silicone layer 3 can be between 5 and 30 μm thick. These thicknesses are reduced significantly by the orientation operation, so that silicone layers 3 with a thickness of 1 to 5 μm are achievable.
The silicone layer 3 is stabilised by the substrate layer 2 and the top layer 4 in the orientation operation. The particular effect is that the silicone layer 3 does not form cracks or tear apart completely.
The top layer 4 or the substrate layer 2 can be pulled off after the orientation operation.
It is, however, also conceivable for a tie layer 5 to be provided between the silicone layer 3 and the substrate layer 2 and / or the top layer 4, as is shown in Fig. 2.
The adhesive force between the individual layers can be adapted over a wide range via the tie layer 5. Ethylene acryl ate copolymers, ethylene vinyl acetate, acid copolymers, ionomers etc. can in particular be used as tie layers.
It is, however, also conceivable for at least the substrate layer 2 or the top layer 3 to be provided as an additional web and to be added directly after extrusion.
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Such a coextrudate is particularly suitable for the production and lining of containers that are to be filled with sticky substances.
It is therefore conceivable for the coextrudate 1 to be used to wrap blocks etc. of pressure-sensitive adhesives, for example. It is, however, also conceivable that the coextrudate 1 is thermoformed to produce a container 6. It is, however, also possible for the coextrudate 1 to be applied to another substrate, from which a pack is produced together with the coextrudate 1, for example by thermoforming.
The coextrudate 1 is oriented in the thermoforming operation.
It is also conceivable that only part of the coextrudate 1 is used for the thermoforming and / or packaging operation.
The substrate layer 2 or the lop layer 4 of the coextrudate 1 can, for example, be pulled off before the rest of the coextrudate is, for example, applied to a thick layer of polypropylene film. This thick layer of film is then thermoformed together with the silicone layer 3. The remaining top layer 4 or substrate layer 2 prevent unwelcome cracking of the silicone layer 3, as it does during orientation. The remaining top layer 4 or substrate layer 2 can be pulled off after the thermoforming operation or shortly before the container is filled with the product that is being packaged. Damage to the silicone layer 3 is prevented during transport of the container as a result.
It is, however, also conceivable for the coextrudate 1 to be used for other applications too. The coextrudate 1 can. for example, be the basis for the production of labels, hygiene packs, films that provide protection against environmental influences, removable protective films, intermediate layers in panes of safety glass, window panes etc. Additional layers that are needed for these applications are either added to the
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coextrudate 1 subsequently or they arc extruded directly together with the layers of the coextrudate 1.
It is conceivable particularly when the coextrudate 1 is used for hygiene packs that the substrate film is provided with a filler such as chalk.
It is also conceivable that, for example, a coextrudate 1 manufactured by the blown film process with a substrate layer 2 thickness of between 100 and 300 μm, a tie layer thickness of between 10 and 20 μm and an extruded silicone layer thickness of between 8 and 15 μm is oriented in such a way that the thickness of the substrate film after orientation is between 30 and 70 μm. The silicone layer is reduced to a thickness of up to 1 urn in this process. The stiffness and strength of the coextrudate is increased considerably at the same time.
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We Claim:
1. Process for the production of thin layers of extrudable silicone, wherein the silicone layer is extruded.
2. Process according to claim 1, wherein the silicone layer is extruded onto a substrate
layer.
3. Process according to claim 1 or 2. wherein the silicone layer and the substrate layer
are extruded together out of an extrusion die.
4. Process according to claim 1, 2 or 3, wherein the substrate layer is added after the silicone layer has been extruded.
5. Process according to claim 1, 2, 3 or 4, wherein the silicone layer is covered by a top layer.
6. Process according to claim 5, wherein the top layer is added after the silicone layer has
been extruded.
7. Process according to claim 5, wherein the top layer is extruded together with the silicone layer.
8. Process according to one of the previous claims, wherein a tie layer is incorporated between the substrate layer and the silicone layer.
9. Process according to one of the previous claims, wherein a tie layer is incorporated between the top layer and the silicone layer.
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10. Process according to claim 8 or 9, wherein the tie layer is extruded together with the silicone layer.
11. Process according to claim 8 or 9, wherein the tie layer is extruded together with the top layer or the substrate layer.
12. Process according to claim 8 or 9. wherein the tie layer is applied to the silicone layer after the latter has already been extruded.
13. Process according to claim 8 or 9, wherein the tie layer is applied to the top layer and / or substrate layer after the latter have already been extruded.
14. Process according to one of the previous claims, wherein a complete multilayer
combination consisting of a substrate layer, a silicone layer and a top layer is coextruded.
15. Process according to claim 14, wherein a tie layer provided between the silicone layer
and the substrate layer and / or top layer is coextruded together with the other layers.
16. Process according to one of the previous claims, wherein the combination of the substrate layer and the silicone layer is oriented.
17. Process according to one of the previous claims, wherein the combination of the substrate layer, silicone layer and top layer is oriented.

18. Process according to one of the previous claims, wherein at least the substrate layer and / or top layer is pulled off after extrusion and / or orientation.
19. Process according to one of the previous claims, wherein the Finished silicone layer is wound up.
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20. Process according to claim 19, wherein a top layer or a substrate layer is provided between two layers of the silicone layer.
21. Thin, extruded silicone produced by a process according to claims 1 to 20, wherein a thermoplastic silicone elastomer is provided.
22. Thin silicone according to claim 21, wherein a thermoplastic material, particularly a thermoplastic film, is provided as the substrate layer and / or top layer.

23. Thin silicone according to claim 22, wherein polyethylene, particularly LDPE or LLDPE, is provided as the thermoplastic material.
24. Thin silicone according to claim 22 or 23, wherein polypropylene, particularly polypropylene homopolymers and polypropylene copolymers, is provided as the thermoplastic material.
25. Thin silicone according to one of claims 21 to 24. wherein a blend of different materials is provided as the substrate layer and / or lop layer.
26. Thin silicone according to one of claims 21 to 25, wherein ethylene acrylate
copolymers, ethylene vinyl acetate copolymers, acid copolymers or ionomers are used as
tie layers.
27. Thin silicone according to claim 26, wherein the tie layers consist of blends that
contain ethylene acrylate copolymers, ethylene vinyl acetate copolymers, acid copolymers
and / or ionomers at least to some extent.
28. Thin silicone according to claim 26 or 27, wherein ethylene vinyl acetate copolymers
are provided as tie layers, where the copolymers preferably account for more than 5 %.
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29. Thin silicone according to one of claims 21 to 28, wherein the substrate layer is
between 5 and 3 000 μ thick before orientation, is in particular between 10 and 500 μ thick
and is preferably between 10 and 200 μ thick.
30. Thin silicone according to one of claims 21 to 29, wherein the top layer is between 5 and 3 000 μ thick before orientation, is in particular between 10 and 500 μ thick and is preferably between 10 and 200 μ thick.
31. Thin silicone according to one of claims 21 to 30, wherein the thermoplastic silicone elastomer is between 1 and 3 000 μ thick, is in particular between 1 and 70 thick, is in particular between 1 and 30 μ thick and is very particularly between 5 and 20 μ thick.
32. Thin silicone according to one of claims 21 to 31, wherein more than 90% of the
thermoplastic silicone elastomer is preferably accounted for by an organic silicone
component.
33. Thin silicone according to one of claims 21 to 32, wherein the silicone elastomer has a release force in relation to adhesives, particularly in relation to pressure-sensitive adhesives, of between 1 and 700 cN/cm, preferably between 5 and 100 cN/cm.
34. Thin silicone according to one of claims 2! to 33, wherein the silicone elastomer has a melt viscosity of between 10 000 and 100 000, in particular between 35 000 and 45 000 Pas.
35. Thin silicone according to one of claims 21 to 34, wherein the silicone elastomer has a Shore hardness level of between 10 and 100 and in particular between 50 and 60.
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36. Thin silicone according to one of claims 21 to 35, wherein the reduction in adhesive force in accordance with FINAT 11 of a pressure-sensitive adhesive due to the silicone elastomer is 37. Thin silicone according to one of claims 21 to 36, wherein the thickness of the silicone elastomer layer amounts to between 1 and 400 μ after orientation, is in particular between 1 and 50 μ and is preferably between 1 and 5 μ.
38. Use of thin silicone according to one of claims 21 to 37, produced according to one of claims 1 to 20, wherein a combination of a silicone layer and a top layer and / or substrate layer is used to produce, cover or line an object provided with a silicone layer, in particular a pack or a container.
39. Use according to claim 38, wherein the silicone layer is laminated to a basic material, where the substrate or lop layer is lacing away from the basic material, and is then thermoformed together with the basic material to produce a container.

40. Use according to claim 38, wherein the combination of a substrate layer, a silicone layer and a top layer is applied to a basic material together and is then thermoformed together with the basic material to produce a container.
41. Use according to claim 38, wherein the combination of a substrate layer, a silicone layer and a top layer is thermoformed together to produce a container.
42. Use according to claim 39, 40 or 41, wherein the substrate layer or the top layer is pulled off after the container has been completed.
43. Use according to one of claims 38 to 42, wherein the silicone layer forms a highly transparent protective layer for the object that preferably resists weathering.
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44. Use according to one of claims 38 to 43, wherein the silicone layer forms a protective
layer for the object that repels dirt.
45. Use according to one of claims 38 to 44. wherein the silicone layer is used as a
protective layer on particularly smooth .surfaces.
46. Use according to claim 45, wherein the silicone layer is bonded to particularly smooth surfaces by adhesion.
47. Use according to one of claims 38 to 46, wherein the silicone layer is used as a release layer in patterns of any kind.
48. Use according to one of claims 38 to 47, wherein the silicone layer is used in hygiene applications, particularly in hygiene packaging etc.
49. Use according to one of claims 38 to 48, wherein the silicone layer is used as an
intermediate layer between several layers of a window pane.
50. Use according to one of claims 38 to 49, wherein the silicone layer is produced
in combination with further layers and forms a window pane etc, together with
these layers.
Dated this 31ST day of October, 2005


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ABSTRACT
Process for the production of thin layers of extrudable silicone, where the silicone layer is extruded. In this context, the silicone layer can be extruded to a substrate layer or the silicone layer and the substrate layer can be extruded from an extrusion die together.
To
The Controller of Patent
The Patent Office
Mumbai
20

Documents:

1384-MUM-2005-ABSTRACT(10-8-2009).pdf

1384-mum-2005-abstract(7-11-2005).pdf

1384-mum-2005-abstract(granted)-(17-8-2010).pdf

1384-mum-2005-abstract.doc

1384-mum-2005-abstract.pdf

1384-MUM-2005-CANCELLED PAGES(10-8-2009).pdf

1384-MUM-2005-CLAIMS(10-8-2009).pdf

1384-mum-2005-claims(7-11-2005).pdf

1384-mum-2005-claims(granted)-(17-8-2010).pdf

1384-mum-2005-claims.doc

1384-mum-2005-claims.pdf

1384-mum-2005-correspondence(9-8-2007).pdf

1384-mum-2005-correspondence(ipo)-(17-8-2010).pdf

1384-mum-2005-correspondence-received.pdf

1384-mum-2005-description (complete).pdf

1384-MUM-2005-DESCRIPTION(COMPLETE)-(10-8-2009).pdf

1384-mum-2005-description(complete)-(7-11-2005).pdf

1384-mum-2005-description(granted)-(17-8-2010).pdf

1384-MUM-2005-DRAWING(10-8-2009).pdf

1384-mum-2005-drawing(7-11-2005).pdf

1384-mum-2005-drawing(granted)-(17-8-2010).pdf

1384-mum-2005-drawings.pdf

1384-MUM-2005-ENGLISH TRANSLATION(10-8-2009).pdf

1384-MUM-2005-FORM 1(10-8-2009).pdf

1384-mum-2005-form 1(17-11-2005).pdf

1384-mum-2005-form 18(9-8-2007).pdf

1384-mum-2005-form 2(10-8-2009).pdf

1384-mum-2005-form 2(7-11-2005).pdf

1384-mum-2005-form 2(granted)-(17-8-2010).pdf

1384-MUM-2005-FORM 2(TITLE PAGE)-(10-8-2009).pdf

1384-mum-2005-form 2(title page)-(7-11-2005).pdf

1384-mum-2005-form 2(title page)-(granted)-(17-8-2010).pdf

1384-mum-2005-form-1.pdf

1384-mum-2005-form-2.doc

1384-mum-2005-form-2.pdf

1384-mum-2005-form-3.pdf

1384-mum-2005-form-5.pdf

1384-MUM-2005-GENERAL POWER OF ATTORNEY(10-8-2009).pdf

1384-MUM-2005-REPLY TO EXAMNIATION REPORT(10-8-2009).pdf

1384-mum-2005-specification(amended)-(10-8-2009).pdf

abstract1.jpg


Patent Number 242159
Indian Patent Application Number 1384/MUM/2005
PG Journal Number 34/2010
Publication Date 20-Aug-2010
Grant Date 17-Aug-2010
Date of Filing 07-Nov-2005
Name of Patentee HUHTAMAKI FORCHHEIM ZWEIGNIEDERLASSUNG DER HUHTAMAKI DEUTSCHLAND GMBH &CO., KG
Applicant Address ZWEIBRUECKENSTRASSE. 15-25 D-91301 FORCHHEIM
Inventors:
# Inventor's Name Inventor's Address
1 MULLER JOSEF Zweibruckenstr. 15-25 D-91301 Forchheim
2 GUNTER WALTER Zweibruckenstr. 15-25 D-91301 Forchheim
3 BAUER MICHAEL Zweibruckenstr. 15-25 D-91301 Forchheim
4 STARK KURT Zweibruckenstr. 15-25 D-91301 Forchheim
PCT International Classification Number C08G77/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 102004057382.4 2004-11-26 Germany