US2618557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of developing sensitive photographic materials
Assignee: Eastman Kodak Co
•
Filing: 1948-08-06
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Granted: 1952-11-18
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Expires: 1968-08-06
Abstract
No abstract record available.
Inventors
- 👤 Edward B Knott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/035; G03C2001/03564
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE METHOD OF REDUCING OR ELIMINATING THE TENDENCY FOR A SURFACE DEVELOPER TO PRODUCE A VISIBLE IMAGE IN A SILVER HALIDE EMULSION (I) A TEST PORTION OF WHICH UPON EXPOSURE TO A LIGHT INTENSITY SCALE FOR A FIXED TIME BETWEEN 1/100 AND 1 SECOND AND DEVELOPMENT FOR 3 MINUTES AT 20* C. IN THE FOLLOWING INTERNAL TYPE DEVELOPER:
Claim 2
Independent Claim
58 words
THE METHOD OF REDUCING OR ELIMINATING THE TENDENCY FOR A SURFACE DEVELOPER TO PRODUCE A VISIBLE IMAGE IN A SILVER HALIDE EMULSION (I) A TEST PORTION OF WHICH UPON EXPOSURE TO A LIGHT INTENSITY SCALE FOR A FIXED TIME BETWEEN 1/100 AND 1 SECOND AND DEVELOPMENT FOR 3 MINUTES AT 20* C. IN THE FOLLOWING INTERNAL TYPE DEVELOPER:
References Cited (Backward Citations)
US2456956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |