US2939788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel photographic developers
Assignee: Polaroid Corp
•
Filing: 1959-02-26
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Granted: 1960-06-07
•
Expires: 1979-02-26
Abstract
No abstract record available.
Inventors
- 👤 Elkan R Blout
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:06
CPC Classifications
C; C07; C07D; C07D203/00; C07D203/04; C07D203/06; C07D203/08; C07D203/14; G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3021; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PHOTOGRAPHIC PROCESS COMPRISING THE STEPS OF DEVELOPING A SILVER HALIDE EMULSION WITH AN AQUEOUS ALKALINE SOLUTION COMPRISING A SILVER HALIDE DEVELOPING AGENT SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
34 words
A PHOTOGRAPHIC PROCESS COMPRISING THE STEPS OF DEVELOPING A SILVER HALIDE EMULSION WITH AN AQUEOUS ALKALINE SOLUTION COMPRISING A SILVER HALIDE DEVELOPING AGENT SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
US2619484A
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US2533990A
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US2544910A
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US2759825A
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US2606900A
Cited
US2779617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |