Patent US3629336A successfully refreshed from Google Patents.
US3629336A
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Ligands which are also silver halide developing agents
Assignee: Polaroid Corp
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Filing: 1969-12-01
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Granted: 1971-12-21
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Expires: 1989-12-01
Abstract
Abstract LIGANDS OR CO-ORDINATING AGENTS WHICH WILL FORM A CO-ORDINATION COMPLEX WITH A METAL AND WHICH ALSO INCLUDE A SILVER HALIDE DEVELOPING FUNCTION PARTICULARLY A PARADIHYDROXYPHENYL SILVER HALIDE DEVELOPING FUNCTION OR A SUBSTITUTED DERIVATIVE THEREOF, THEREBY MAKING THEM ADDITIONALLY USEFUL IN PHOTOGRAPHY.
Inventors
- 👤 Elbert M Idelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:24
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/61; C07C45/67; C07C45/68; C07C45/72; C07C45/74; C07C279/00; C07C279/20; C07C279/24; C07C279/26; C07C45/56; C07C45/62; C07C49/00; C07C49/92; C07C68/00; C07C68/02; C09; C09B; C09B45/00; C09B45/02; C09B45/14; C09B45/48; G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3021; G03C7/00; G03C7/30; G03C7/32; G03C8/00; G03C8/02; G03C8/08; G03C8/10; G03C8/12; G03C8/14; G03C8/16; G03C8/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |