US3220839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions containing isothiourea derivatives
Assignee: Eastman Kodak Co
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Filing: 1961-08-25
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Granted: 1965-11-30
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Expires: 1981-08-25
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Herz
- 👤 Norman W Kalenda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346; G03C1/42; G03C5/00; G03C5/26; G03C5/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING AT LEAST ONE MOLE PER MOLE OF SILVER HALIDE OF AN ISOTHIOUREA DERIVATIVE HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
28 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION CONTAINING AT LEAST ONE MOLE PER MOLE OF SILVER HALIDE OF AN ISOTHIOUREA DERIVATIVE HAVING A FORMULA SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |