Patent US3239339A successfully refreshed from Google Patents.
US3239339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel photographic products, compositions and processes
Assignee: Polaroid Corp
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Filing: 1961-05-05
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Granted: 1966-03-08
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Expires: 1981-05-05
Abstract
No abstract record available.
Inventors
- 👤 Dershowitz Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:57
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; G03C8/14; G03C8/16; G03C8/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A PHOTOGRAPHIC DEVELOPER COMPOSITION COMPRISING AN AQUEOUS ALKALINE SOLUTION CONTAINING AT LEAST ONE ACCELERATING SILVER HALIDE DEVELOPING AGENT WHICH IS SUBSTANTIALLY COLORLESS IN AT LEAST ITS UNOXIDIZED FORM AND AN ANTHRAPYRIMIDONE DYE, AT LEAST ONE OF THE 3 AND 6 POSITION NUCLEAR CARBON ATOMS OF SAID ANTHRAPYRIMIDONE NUCLEUS HAVING LINKED THERETO A GROUP OF THE FORMULA:
Claim 2
Dependent Claim
56 words
A PHOTOGRAPHIC DEVELOPER COMPOSITION COMPRISING AN AQUEOUS ALKALINE SOLUTION CONTAINING AT LEAST ONE ACCELERATING SILVER HALIDE DEVELOPING AGENT WHICH IS SUBSTANTIALLY COLORLESS IN AT LEAST ITS UNOXIDIZED FORM AND AN ANTHRAPYRIMIDONE DYE, AT LEAST ONE OF THE 3 AND 6 POSITION NUCLEAR CARBON ATOMS OF SAID ANTHRAPYRIMIDONE NUCLEUS HAVING LINKED THERETO A GROUP OF THE FORMULA:
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US2076197A
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Cited
US2983605A
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US2983606A
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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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |