US4381329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic film for use in the manufacture of forgery-resistant identification documents
Assignee: Hoechst AG
•
Filing: 1981-07-08
•
Granted: 1983-04-26
•
Expires: 2001-07-08
Abstract
Abstract A thermoplastic protective film for use in the manufacture of forgery-resistant identification documents, comprising a base layer and a cover layer comprising a partially hydrolyzed olefin/vinyl ester copolymer. The cover-layer side of the film is laminated under the action of heat to the identification document.
Inventors
- 👤 Hermann Dallmann
- 👤 Hans J. Palmen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:25
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/10; B32B27/08; B32B27/28; B32B27/30; B32B27/304; B32B27/34; B32B27/36; B32B27/365; B42; B42D; B42D25/00; B42D25/40; B42D25/45; B42D25/455; B42D25/465; B42D25/47; B32B2270/00; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2310/00; B32B2310/14; B32B2317/00; B32B2317/12; B32B2327/00; B32B2327/06; B32B2331/00; B32B2367/00; B32B2369/00; B32B2377/00; B32B2554/00; B42D2033/04; B42D2033/30; B42D2035/06; B42D25/46; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24876; Y10T428/24893; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31573; Y10T428/31576; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31891; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31935; Y10T428/31938
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
80 words
A forgery-resistant identification document comprising a core carrying identifying information, said core having laminated thereto the cover layer side of a thermoplastic protective film comprising a base layer and a cover layer comprising a partially hydrolyzed olefin/vinyl ester copolymer, the degree of hydrolysis of said copolymer lying in the range from 20 to 99 percent, said laminated protective film being impossible to detach from said document at temperatures up to and as high as 120° C. without destroying said document.
Claim 2
Dependent Claim
80 words
A forgery-resistant identification document comprising a core carrying identifying information, said core having laminated thereto the cover layer side of a thermoplastic protective film comprising a base layer and a cover layer comprising a partially hydrolyzed olefin/vinyl ester copolymer, the degree of hydrolysis of said copolymer lying in the range from 20 to 99 percent, said laminated protective film being impossible to detach from said document at temperatures up to and as high as 120° C. without destroying said document.
Claim 3
Dependent Claim
19 words
A forgery-resistant identification document according to claim 1 wherein said cover layer comprises a partially hydrolyzed ethylene/vinyl ester copolymer.
Claim 4
Dependent Claim
19 words
A forgery-resistant identification document according to claim 2 wherein said cover layer comprises a partially hydrolyzed ethylene/vinyl acetate copolymer.
Claim 5
Dependent Claim
23 words
A forgery-resistant identification document according to claim 1 wherein said olefin/vinyl ester copolymer has an olefin content of at least 30 mole percent.
Claim 6
Dependent Claim
28 words
A forgery-resistant identification document according to claim 1 wherein said cover layer comprises a mixture of said partially hydrolyzed copolymer and at least one additional polymer compatible therewith.
Claim 7
Dependent Claim
16 words
A forgery resistant identification document according to claim 5 wherein said additional polymer contains carbonyl groups.
Claim 8
Dependent Claim
25 words
A forgery-resistant identification document according to claim 1 wherein said cover layer carries a further layer printed thereon in the form of a discontinuous pattern.
Claim 9
Dependent Claim
33 words
A forgery-resistant identification document according to claim 1 wherein said base layer is composed of a material selected from the group consisting of polyvinyl chloride, polyester, polycarbonte, polyamide, cellulose acetobutyrate and cellulose acetate.
Claim 10
Dependent Claim
16 words
A forgery-resistant identification document according to claim 8 wherein said base layer is oriented and heat-set.
Claim 11
Dependent Claim
15 words
A forgery-resistant identification document according to claim 8 wherein said base layer comprises polyethylene terephthalate.
Claim 12
Dependent Claim
18 words
A forgery resistant identification document according to claim 10 wherein said base layer is biaxially stretched and heat-set.
Claim 13
Dependent Claim
21 words
A forgery-resistant identification document according to claim 1 further comprising an adhesion-promoting layer between said base layer and said cover layer.
Claim 14
Dependent Claim
22 words
A forgery-resistant identification document according to claim 1 wherein the cover layer surface of said protective film is corona-treated prior to lamination.
Claim 15
Independent Claim
79 words
A method of protecting an identification document against forgery comprising laminating to said document the cover layer side of a thermoplastic protective film comprising a base layer and a cover layer comprising a partially hydrolyzed olefin/vinyl ester copolymer, the degree of hydrolysis of said copolymer lying in the range from 20 to 99 percent, said laminated protective film being impossible to detach from said document at temperatures up to and as high as 120° C. without destroying said document.
Claim 16
Independent Claim
79 words
A method of protecting an identification document against forgery comprising laminating to said document the cover layer side of a thermoplastic protective film comprising a base layer and a cover layer comprising a partially hydrolyzed olefin/vinyl ester copolymer, the degree of hydrolysis of said copolymer lying in the range from 20 to 99 percent, said laminated protective film being impossible to detach from said document at temperatures up to and as high as 120° C. without destroying said document.
Claim 17
Dependent Claim
17 words
A method according to claim 14 wherein said cover layer comprises a partially hydrolyzed ethylene/vinyl ester copolymer.
Claim 18
Dependent Claim
17 words
A method according to claim 15 wherein said cover layer comprises a partially hydrolyzed ethylene/vinyl acetate copolymer.
Claim 19
Dependent Claim
19 words
A method according to claim 14 wherein said copolymer has an olefin content of at least 30 mole percent.
Claim 20
Dependent Claim
26 words
A method according to claim 14 wherein said cover layer comprises a mixture of said partially hydrolyzed copolymer and at least one additional polymer compatible therewith.
Claim 21
Dependent Claim
13 words
A method according to claim 18 wherein said additional polymer contains carbonyl groups.
Claim 22
Dependent Claim
23 words
A method according to claim 14 wherein said cover layer carries a further layer printed thereon in the form of a discontinuous pattern.
Claim 23
Dependent Claim
31 words
A method according to claim 14 wherein said base layer is composed of a material selected from the group consisting of polyvinyl chloride, polyester, polycarbonate, polyamide, cellulose acetobutyrate and cellulose acetate.
Claim 24
Dependent Claim
14 words
A method according to claim 21 wherein said base layer is oriented and heat-set.
Claim 25
Dependent Claim
13 words
A method according to claim 21 wherein said base layer comprises polyethylene terephthalate.
Claim 26
Dependent Claim
15 words
A method according to claim 23 wherein said base layer is biaxially stretched and heat-set.
Claim 27
Dependent Claim
23 words
A method according to claim 14 wherein said protective film further comprises an adhesion-promoting layer between said base layer and said cover layer.
Claim 28
Dependent Claim
20 words
A method according to claim 14 wherein the cover layer surface of said protective film is corona-treated prior to lamination.
References Cited (Backward Citations)
GB888359A
Cited
US3413171A
Cited
US3566521A
Cited
US3595740A
Cited
USB480591I5
Cited
US3949114A
Cited
US4101701A
Cited
FR2302933B1
Cited
US4082854A
Cited
US4096015A
Cited
US4115618A
Cited
DE2736852C3
Cited
US4070774A
Cited
US4093489A
Cited
DE2932575C2
Cited
US4239826A
Cited
US4322461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |