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US2839404A
Expired / Lapsed
US
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Trinuclear optical sensitizing dyes and photographic emulsions containing them
Assignee: Eastman Kodak Co
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Filing: 1955-10-12
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Granted: 1958-06-17
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Expires: 1975-10-12
Abstract
No abstract record available.
Inventors
- 👤 Edward B Knott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:28
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION SENSITIZED WITH A COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
18 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION SENSITIZED WITH A COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
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) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |