US2656273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developers containing diamino-propanol tetracetic acid
Assignee: Eastman Kodak Co
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Filing: 1952-02-12
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Granted: 1953-10-20
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Expires: 1972-02-12
Abstract
No abstract record available.
Inventors
- 👤 Richard W Henn
- 👤 Douglas E Piper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:36
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/3053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A PHOTOGRAPHIC DEVELOPER COMPOSITION COMPRISING A SILVER HALIDE DEVELOPING AGENT AND 1,3-DIAMINO-2-PROPANOL TETRACETIC ACID.
Claim 2
Dependent Claim
14 words
A PHOTOGRAPHIC DEVELOPER COMPOSITION COMPRISING A SILVER HALIDE DEVELOPING AGENT AND 1,3-DIAMINO-2-PROPANOL TETRACETIC ACID.
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) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |