US3725329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic subbing material
Assignee: Eastman Kodak Co
•
Filing: 1971-09-08
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Granted: 1973-04-03
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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
2026-10-23 21:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
13 words
The invention according to claim 1 and wherein said dianhydride has the formula:
Claim 2
Dependent Claim
30 words
The invention according to claim 1 and wherein said 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.
Claim 3
Dependent Claim
13 words
The invention according to claim 1 and wherein said dianhydride is pyromellitic dianhydride.
Claim 4
Dependent Claim
14 words
The invention according to claim 1 and wherein the adhesion promoting solvent is resorcinol.
Claim 5
Dependent Claim
20 words
The invention according to claim 1 and wherein said organic solvent is a mixture of ketonic and halogenated hydrocarbon solvents.
Claim 6
Dependent Claim
26 words
The invention according to claim 1 and wherein said organic solvent is a mixture of cyclohexanone and methylene chloride and said adhesion promoting solvent is resorcinol.
Claim 7
Dependent Claim
36 words
The invention according to claim 1 and wherein said organic solvent is a solvent mixture containing halogenated hydrocarbon solvent, and said adhesion promoting solvent is resorcinol present in concentration of about 3 to about 10 percent.
References Cited (Backward Citations)
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Cited
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US3397254A
Cited
US3499058A
Cited
US3459584A
Cited
US3538186A
Cited
US3541274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |