Patent US2857274A successfully refreshed from Google Patents.
US2857274A
Expired / Lapsed
US
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Photographic compositions and processes
Assignee: Polaroid Corp
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Filing: 1953-09-04
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Granted: 1958-10-21
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Expires: 1973-09-04
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
- 👤 Elkan R Blout
- 👤 Saul G Cohen
- 👤 Green Milton
- 👤 Helen J Tracy
- 👤 Robert B Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:10
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; G03C8/14; G03C8/16; G03C5/00; G03C5/26; G03C5/38
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
58 words
THE PHOTOGRAPHIC METHOD OF PROCESSING A PHOTOEXPOSED SILVER HALIDE ELEMENT AND AN IMAGE-RECEPTIVE ELEMENT WHICH ARE IN SUPERPOSED RELATION, SAID METHOD COMPRISING THE STEPS OF SUBJECTING SAID ELEMENTS TO A THIN LAYER OF AN ALKALINE AQUEOUS SOLUTION OF A PLURALITY OF AGENTS INCLUDING A FIRST COMPLEXING AGENT COMPOSED OF A CYCLIC IMIDE CHARACTERIZED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
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US2225384A
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US2354232A
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US1958609A
Cited
US2543181A
Cited
US2635048A
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US2590775A
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US2599518A
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US2697100A
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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) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |