Patent US2857276A successfully refreshed from Google Patents.
US2857276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic processes and compositions useful therein
Assignee: Polaroid Corp
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Filing: 1954-11-23
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Granted: 1958-10-21
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Expires: 1974-11-23
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
- 👤 Saul G Cohen
- 👤 Helen J Tracy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:02
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3014; G03C5/38; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C8/32; G03C8/36; G03C8/365
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PHOTOGRAPHIC PROCESSING COMPOSITION COMPRISING, IN ALKALINE AQUEOUS SOLUTION, A PLURALITY OF AGENTS INCLUDING A FIRST COMPLEXING AGENT COMPOSED OF A CYCLIC IMIDE SELECTED FROM THE CLASS CONSISTING OF COMPOUNDS WITHIN THE GENERAL FORMULA:
Claim 2
Dependent Claim
34 words
A PHOTOGRAPHIC PROCESSING COMPOSITION COMPRISING, IN ALKALINE AQUEOUS SOLUTION, A PLURALITY OF AGENTS INCLUDING A FIRST COMPLEXING AGENT COMPOSED OF A CYCLIC IMIDE SELECTED FROM THE CLASS CONSISTING OF COMPOUNDS WITHIN THE GENERAL FORMULA:
References Cited (Backward Citations)
US2534599A
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US2543181A
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US2551134A
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US2635048A
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US2590775A
Cited
US2567109A
Cited
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 |