US2534050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of treating photographic layers containing color formers with metal salt hardening agents
Assignee: EIDP Inc
•
Filing: 1946-06-11
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Granted: 1950-12-12
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Expires: 1966-06-11
Abstract
No abstract record available.
Inventors
- 👤 Murray Otis Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:00
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE PROCESS WHICH COMPRISES TREATING A WET PHOTOGRAPHIC ELEMENT PRIOR TO EXPOSURE WITH AN AQUEOUS SOLUTION CONTAINING FROM 2 TO 30 GRAMS PER LITER OF SOLUTION OF A POLYVALENT METAL SALT HARDENING AGENT AND FROM 0.05 TO 2.0% BY WEIGHT, BASED ON THE AMOUNT OF WATER, OF A HYDROTROPIC WETTING AGENT, SAID ELEMENT HAVING A HYDROPHILIC COLLID SILVER HALIDE EMULSION LAYER CONTAINING A COLOR FORMER HAVING AS THE ACTIVE GROUP A STRUCTURE OF THE FORMULA
Claim 2
Dependent Claim
75 words
THE PROCESS WHICH COMPRISES TREATING A WET PHOTOGRAPHIC ELEMENT PRIOR TO EXPOSURE WITH AN AQUEOUS SOLUTION CONTAINING FROM 2 TO 30 GRAMS PER LITER OF SOLUTION OF A POLYVALENT METAL SALT HARDENING AGENT AND FROM 0.05 TO 2.0% BY WEIGHT, BASED ON THE AMOUNT OF WATER, OF A HYDROTROPIC WETTING AGENT, SAID ELEMENT HAVING A HYDROPHILIC COLLID SILVER HALIDE EMULSION LAYER CONTAINING A COLOR FORMER HAVING AS THE ACTIVE GROUP A STRUCTURE OF THE 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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |