US3556788A
Expired / Lapsed
US
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Color photographic elements and process comprising 6-halo-7-hydroxy-1,3,4-trizaindolizines as stabilizers
Assignee: Polaroid Corp
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Filing: 1969-02-10
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Granted: 1971-01-19
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Expires: 1989-02-10
Abstract
Abstract A PHOTOSENSITIVE ELEMENT COMPRISING IN COMBINATION A SUPPORT CARRYING ON ONE SURFACE AT LEAST ONE SILVER HALIDE EMULSION LAYER CONTAINING A 6-HALO-7-HYDROXY-1,3,4TRIAZAINDOLIZINE AND A DYE, SAID DYE BEING A SILVER HALIDE DEVELOPING AGENT, ASSOCIATED WITH SAID EMULSION.
Inventors
- 👤 William H Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:56
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; G; G03; G03C; G03C8/00; G03C8/02
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |