US3674531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic polyester film assemblies
Assignee: Imperial Chemical Industries Ltd
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Filing: 1971-06-01
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Granted: 1972-07-04
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Expires: 1991-06-01
Abstract
Abstract A FILM ASSEMBLY SUITABLE FOR USE AS A BASE FOR PHOTOGRAPHIC FILM COMPRISES SYNTHETIC LINEAR POLYESTER FILM BASE CARRYING A LAYER OF A COPOLYMER OF A VINYL HALOGENO ESTER SUCH AS VINYL CHLOROACETATE WITH AT LEAST ONE OTHER MONOMER COPOLYMERISABLE THEREWITH, THE SAID MONOMER AND AT LEAST ONE OF SAID MONOMERS BEING SELECTED SO THAT THE FINAL COPOLYMER HAS A SOFTENING POINT LOWER THAN THAT OF THE PRODUCT OBTAINED BY POLYMERISATION IN THE ABSENCE OF THE SAID SELECTED MONOMER OR MONOMERS.
Inventors
- 👤 Basil Robert Shephard
- 👤 Margaret Loudon Clachan
- 👤 David Rankine Kennedy
- 👤 Terence Arnold Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:18
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/20; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/043; C08J7/056; G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/915; G03C1/93; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08J2421/00; C08J2421/02; C08J2433/00; C08J2433/04; C08J2433/06; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |