Patent US3134672A successfully refreshed from Google Patents.
US3134672A
Expired / Lapsed
US
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Photographic products, compositions and processes employing azo dye developers
Assignee: Polaroid Corp
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Filing: 1961-10-18
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Granted: 1964-05-26
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Expires: 1981-10-18
Abstract
No abstract record available.
Inventors
- 👤 Elkan R Blout
- 👤 Howard G Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:19
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; G03C8/14; G03C8/16; G03C8/18; G03C7/00; G03C7/30; G03C7/32; G03C7/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
IN A PROCESS OF FORMING A PHOTOGRAPHIC IMAGE IN COLOR, THE STEPS WHICH COMPRISE DEVELOPING AN EXPOSED SILVER HALIDE EMULSION WITH AN AQUEOUS ALKALINE SOLUTION CONTAINING AN AZO DYE DEVELOPER OF THE FORMULA:
References Cited (Backward Citations)
US1854894A
Cited
US2148252A
Cited
GB682665A
Cited
US2457823A
Cited
US2435182A
Cited
US2543691A
Cited
US2698244A
Cited
US2819662A
Cited
US2983606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-26 | 1967-11-25 | 1968-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-26 | 1971-11-25 | 1972-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-26 | 1975-11-25 | 1976-05-26 | $7700.00 | Window Closed / Lapsed |