US2556540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water spot prevention in photographic film
Assignee: Eastman Kodak Co
•
Filing: 1946-04-15
•
Granted: 1951-06-12
•
Expires: 1966-04-15
Abstract
No abstract record available.
Inventors
- 👤 Richard W Henn
- 👤 John I Crabtree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:21
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/268; G03C11/00; G03C11/16; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/04; Y10S516/06; Y10S516/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF PREVENTING WATER SPOTS ON PHOTOGRAPHIC FILM DURING DRYING WHICH COMPRISES TREATING A DEVELOPED, FIXED AND WASHED SILVER HALIDE PHOTOGRAPHIC FILM, WITH SOLUTION CONTAINING A NON-IONIC WETTING AGENT SELECTED FROM THE CLASS CONSISTING OF PARTIAL ESTERS OF POLYHYDRIC ALCOHOLS WITH LONG-CHAIN FATTY ACIDS, ESTERS OF WATER-SOLUBLE HYDROOXYALKYL ESTERS OF POLYHYDRIC ALCOHOLS WITH LONG-CHAIN CARBOXYLIC ACIDS, AND POLYETHERS, POLYETHER ALCOHOLS, AND THEIR ESTERS, AND DRYING THE FILM WHILE CONTAINING A RESIDUE OF SAID WETTING AGENT.
Claim 2
Independent Claim
76 words
THE METHOD OF PREVENTING WATER SPOTS ON PHOTOGRAPHIC FILM DURING DRYING WHICH COMPRISES TREATING A DEVELOPED, FIXED AND WASHED SILVER HALIDE PHOTOGRAPHIC FILM, WITH SOLUTION CONTAINING A NON-IONIC WETTING AGENT SELECTED FROM THE CLASS CONSISTING OF PARTIAL ESTERS OF POLYHYDRIC ALCOHOLS WITH LONG-CHAIN FATTY ACIDS, ESTERS OF WATER-SOLUBLE HYDROOXYALKYL ESTERS OF POLYHYDRIC ALCOHOLS WITH LONG-CHAIN CARBOXYLIC ACIDS, AND POLYETHERS, POLYETHER ALCOHOLS, AND THEIR ESTERS, AND DRYING THE FILM WHILE CONTAINING A RESIDUE OF SAID WETTING AGENT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |