US2675314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antistain agents for photographic color materials
Assignee: Eastman Kodak Co
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Filing: 1951-04-10
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Granted: 1954-04-13
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Expires: 1971-04-10
Abstract
No abstract record available.
Inventors
- 👤 Paul W Vittum
- 👤 John R Thirtle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:20
CPC Classifications
G; G07; G07F; G07F7/00; G07F7/08; G07F7/10; G07F7/1008; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/39212; G03C7/39216
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
IN A PROCESS OF COLOR PHOTOGRAPHY, THE METHOD OF PREVENTING COLOR STAIN IN A PHOTOGRAPHIC SILVER HALIDE EMULSION HAVING A NON-DIFFUSING COLOR COUPLER THEREIN, WHICH COMPRISES EXPOSING SAID EMULSION AND DEVELOPING IT WITH A PRIMARY AROMATIC AMINO DEVELOPING AGENT IN THE PRESENCE OF A COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
48 words
IN A PROCESS OF COLOR PHOTOGRAPHY, THE METHOD OF PREVENTING COLOR STAIN IN A PHOTOGRAPHIC SILVER HALIDE EMULSION HAVING A NON-DIFFUSING COLOR COUPLER THEREIN, WHICH COMPRISES EXPOSING SAID EMULSION AND DEVELOPING IT WITH A PRIMARY AROMATIC AMINO DEVELOPING AGENT IN THE PRESENCE OF A COMPOUND HAVING THE FORMULA:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |