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US3241967A
Expired / Lapsed
US
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Photographic developer composition containing 2-hydroxymethyl-3-pyrazolidones
Assignee: Eastman Kodak Co
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Filing: 1965-02-17
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Granted: 1966-03-22
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Expires: 1985-02-17
Abstract
No abstract record available.
Inventors
- 👤 Marle David J De
- 👤 Thomas S Donovan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:54
CPC Classifications
C; C07; C07D; C07D231/00; C07D231/02; C07D231/06; C07D231/08; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/42; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3028; G03C5/3035; G03C8/00; G03C8/02; G03C8/04; G03C8/06; Y; Y10; Y10S; Y10S430/00; Y10S430/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
11 words
AN ALKALINE PHOTOGRAPHIC DEVELOPER SOLUTION CONTAINING A COMPOUND HAVING THE FORMULA:
Claim 2
Dependent Claim
11 words
AN ALKALINE PHOTOGRAPHIC DEVELOPER SOLUTION CONTAINING A COMPOUND HAVING THE FORMULA:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |