Patent US3775152A successfully refreshed from Google Patents.
US3775152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic subbing material
Assignee: Eastman Kodak Co
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Filing: 1971-09-08
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Granted: 1973-11-27
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Expires: 1991-09-08
Abstract
Abstract Solvent soluble carboxylated polyester subbing materials for photographic elements. An organic solvent soluble polyester is carboxylated by treatment, during the latter stages of polymerization, with an organic dianhydride to produce an organic solvent soluble carboxylated polyester. The solvent soluble carboxylated polyester is effectively used in subbing compositions, desirably containing attack solvent, e.g., coated onto a polyester photographic film support and has excellent adhesion both to the support and to conventional gelatincellulose ester subbing layers used to adhere a gelatino silver halide emulsion to the support.
Inventors
- 👤 F Jacoby
- 👤 F Hamb
- 👤 L Trent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:17
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93; C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
The invention according to claim 1, and further including at least one gelatinous layer on and firmly adhered to said dianhydride modified polyester layer.
Claim 2
Dependent Claim
14 words
The invention according to claim 1, and wherein said organic dianhydride is pyromellitic dianhydride.
Claim 3
Dependent Claim
119 words
In a process for the preparation of photographic elements comprising light sensitive gelatinous layers on polyester support, said processing comprising: a. treating at least one surface of a polyester support to render it more adherent to gelatinous materials; b. coating the treated surface with a gelatin-cellulose nitrate subbing composition; and c. coating on said gelatin-cellulose nitrate at least one light sensitive gelatino-silver halide emulsion; the improvement, wherein said treating is performed by (a'') coating said polyester with a solution consisting essentially of about 0.5 to about 25 percent by weight solvent soluble, dianhydride modified polyester, about 65-80 percent by weight solvent for said dianhydride modified polyester, and about 3-10 percent by weight attack solvent, and (a'''') evaporating said solvents.
Claim 4
Dependent Claim
31 words
The invention according to claim 1 and wherein said organic dianhydride is selected from the group consisting of pyromellitic dianhydride, 3,4,3'',4''-benzophenonetetracarboxylic dianhydride, 1,2,3,4-cyclopentane-tetracarboxylic dianhydride and the dimaleic anhydride adduct of myrcene.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |