US2604399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic developers comprising bis-(di-hydroxyalkyl aminomethyl)-hydroquinones
Assignee: Eastman Kodak Co
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Filing: 1949-07-07
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Granted: 1952-07-22
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Expires: 1969-07-07
Abstract
No abstract record available.
Inventors
- 👤 Thomas S Donovan
- 👤 Frederic R Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:51
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3021; Y; Y10; Y10S; Y10S430/00; Y10S430/135; Y10S430/167
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
28 words
A PHOTOGRAPHIC SILVER HALIDE DEVELOPER SOLUTION COMPRISING AS THE ACTIVE DEVELOPING AGENT AN ACID ADDITION SALT OF A COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
28 words
A PHOTOGRAPHIC SILVER HALIDE DEVELOPER SOLUTION COMPRISING AS THE ACTIVE DEVELOPING AGENT AN ACID ADDITION SALT OF A COMPOUND SELECTED FROM THOSE REPRESENTED BY THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2163166A
Cited
US2304953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-22 | 1956-01-21 | 1956-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-22 | 1960-01-21 | 1960-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-22 | 1964-01-21 | 1964-07-22 | $7700.00 | Window Closed / Lapsed |