Patent US4341833A successfully refreshed from Google Patents.
US4341833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forgery-resistant film
Assignee: HOECHSTAKTIENGESELLSCHAFT A CORP OF GERMANY
•
Filing: 1979-10-15
•
Granted: 1982-07-27
•
Expires: 1999-10-15
Abstract
Abstract The film disclosed in the application is secure against forgeries and serves for marking articles, in particular high-quality branded goods. It is comprised of at least one transparent polyester film oriented by stretching and containing in its composition an organic dyestuff which is heat stable at temperatures above about 260° C. Preferably, a laminate is used which is comprised of two films, one of which contains a different colored dyestuff than does the other.
Inventors
- 👤 Helmut Schafer
- 👤 Manfred Unger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:20
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/36; B32B27/06; B32B27/08; B32B27/18; B32B7/00; B32B7/04; B32B7/12; C; C08; C08J; C08J5/00; C08J5/18; B32B2307/00; B32B2307/40; B32B2307/412; B32B2307/50; B32B2307/514; B65; B65D; B65D2401/00; C08J2367/00; C08J2367/02; Y; Y10; Y10S; Y10S283/00; Y10S283/904; Y10S428/00; Y10S428/91; Y10S428/916; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/31504; Y10T428/31786; Y10T428/31794
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A film which offers protection against forgeries and is suitable for marking articles, comprising a laminate comprised of two transparent films joined to one another over their surface, each of said films being oriented by stretching and being comprised of a polyester resin and in admixture therewith an organic dyestuff which is heat stable at temperatures above about 260° C., wherein one of the laminated transparent film layers comprises as the dyestuff anthraceno [2, l-m; 1,9 a-n; 9a, 9-a] thioxanthene and the other film layer comprises as the dyestuff N-(n-octadecyl)-benzo [k,l] thioxanthene-3,4-dicarboximide.
Claim 2
Dependent Claim
92 words
A film which offers protection against forgeries and is suitable for marking articles, comprising a laminate comprised of two transparent films joined to one another over their surface, each of said films being oriented by stretching and being comprised of a polyester resin and in admixture therewith an organic dyestuff which is heat stable at temperatures above about 260° C., wherein one of the laminated transparent film layers comprises as the dyestuff anthraceno [2, l-m; 1,9 a-n; 9a, 9-a] thioxanthene and the other film layer comprises as the dyestuff N-(n-octadecyl)-benzo [k,l] thioxanthene-3,4-dicarboximide.
References Cited (Backward Citations)
US3434916A
Cited
US3969176A
Cited
US3900653A
Cited
US3983285A
Cited
US4198458A
Cited
US4041206A
Cited
US4048150A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-26 | 1986-01-25 | 1986-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-26 | 1990-01-25 | 1990-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-26 | 1994-01-25 | 1994-07-27 | $7700.00 | Window Closed / Lapsed |