Patent US2681856A successfully refreshed from Google Patents.
US2681856A
Expired / Lapsed
US
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Photographic material and process for making an azo dye bleachout image
Assignee: GASPAR
•
Filing: 1949-04-04
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Granted: 1954-06-22
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Expires: 1969-04-04
Abstract
No abstract record available.
Inventors
- 👤 Gaspar Bela
- 👤 Dreyfuss Paul Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:47
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/28; G03C7/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A PHOTOGRAPHIC MATERIAL COMPRISING A SILVER HALIDE EMULSION LAYER CONTAINING AS AN AZO COUPLING COMPONENT AN AZO DYE HAVING THE FORMULA
Claim 2
Dependent Claim
21 words
A PHOTOGRAPHIC MATERIAL COMPRISING A SILVER HALIDE EMULSION LAYER CONTAINING AS AN AZO COUPLING COMPONENT AN AZO DYE HAVING THE FORMULA
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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) | 1957-06-21 | 1957-12-21 | 1958-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-21 | 1961-12-21 | 1962-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-21 | 1965-12-21 | 1966-06-22 | $7700.00 | Window Closed / Lapsed |