Patent US4208530A successfully refreshed from Google Patents.
Patent US3379533A successfully refreshed from Google Patents.
US3379533A
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US
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Dyes derived from 1, 2-disubstituted-3, 5-pyrazolidinediones and photographic elements containing such dyes
Assignee: Eastman Kodak Co
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Filing: 1963-06-10
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Granted: 1968-04-23
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Expires: 1983-06-10
Abstract
No abstract record available.
Inventors
- 👤 Philip W Jenkins
- 👤 Leslie G S Brooker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:39
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832; C; C09; C09B; C09B23/00; C09B23/02; C09B23/04; C09B23/06; C09B23/08; C09B23/083; C09B23/10; C09B23/105; C09B23/107; C09B23/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
19 words
A LIGHT-SENSITIVE PHOTOGRAPHIC EMULSION COMPRISING A HYDROPHILIC COLLOID, SILVER HALIDE AND A DYE SELECTED FROM THOSE HAVING THE FORMULA:
References Cited (Backward Citations)
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US2427911A
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US2639282A
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GB781551A
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US2955939A
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US2895955A
Cited
US2984664A
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US2965486A
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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) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |