US3342597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color developer precursor
Assignee: Eastman Kodak Co
•
Filing: 1964-06-08
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Granted: 1967-09-19
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Expires: 1984-06-08
Abstract
No abstract record available.
Inventors
- 👤 Donald P Harnish
- 👤 Richard L Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:16
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/407; G03C7/413; G03C7/4136; G03C1/00; G03C1/005; G03C1/06; G03C1/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
AN UNEXPOSED LIGHT SENSITIVE SILVER HALIDE EMULSION HAVING UNIFORMLY DISPERSED THEREIN, A PARAPHENYLENEDIAMINE PERCURSOR HAVING THE FOLLOWING GENERAL FORMULA: 1-(O=),2-R,4-(R3-N(-R2)-(R1-1,4-PHENYLENE)-N=),R5-1,4DIHYDRONAPHTHALENE IN WHICH R IS AN ELECTRON WITHDRAWING GROUP SELECTED FROM THE CLASS CONSISTING OF -COCH3, -COOC2H5 AND -CONHR4, WHEREIN R4 IS SELECTED FROM THE CLASS CONSISTING OF HYDROGEN, ALKYL (1-4 CARBON ATOMS),
Claim 2
Dependent Claim
52 words
AN UNEXPOSED LIGHT SENSITIVE SILVER HALIDE EMULSION HAVING UNIFORMLY DISPERSED THEREIN, A PARAPHENYLENEDIAMINE PERCURSOR HAVING THE FOLLOWING GENERAL FORMULA: 1-(O=),2-R,4-(R3-N(-R2)-(R1-1,4-PHENYLENE)-N=),R5-1,4DIHYDRONAPHTHALENE IN WHICH R IS AN ELECTRON WITHDRAWING GROUP SELECTED FROM THE CLASS CONSISTING OF -COCH3, -COOC2H5 AND -CONHR4, WHEREIN R4 IS SELECTED FROM THE CLASS CONSISTING OF HYDROGEN, ALKYL (1-4 CARBON ATOMS),
References Cited (Backward Citations)
US3185567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |