Patent US2459136A successfully refreshed from Google Patents.
US2459136A
Expired / Lapsed
US
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Dry developing negative
Assignee: GAF Chemicals Corp
•
Filing: 1944-09-07
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Granted: 1949-01-11
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Expires: 1964-09-07
Abstract
No abstract record available.
Inventors
- 👤 Slifkin Sam Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/64
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB232307A
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US1602589A
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US1738530A
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US1880449A
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US1944293A
Cited
US1976302A
Cited
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Cited
GB439812A
Cited
US2019737A
Cited
US2095839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-01-11 | 1952-07-12 | 1953-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-01-11 | 1956-07-12 | 1957-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-01-11 | 1960-07-12 | 1961-01-11 | $7700.00 | Window Closed / Lapsed |