Patent US2419975A successfully refreshed from Google Patents.
US2419975A
Expired / Lapsed
US
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Increasing speed and contrast of photographic emulsions
Assignee: Eastman Kodak Co
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Filing: 1943-08-26
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Granted: 1947-05-06
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Expires: 1963-08-26
Abstract
No abstract record available.
Inventors
- 👤 Adrian P H Trivelli
- 👤 William F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/061; Y; Y10; Y10S; Y10S430/00; Y10S430/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2127573A
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US2266442A
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US2196734A
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US2286662A
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US2309492A
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US2220929A
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US2339213A
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US2311098A
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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) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |