US2553498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
First developer for multilayer color film of the reversal type
Assignee: GAF Chemicals Corp
•
Filing: 1947-11-18
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Granted: 1951-05-15
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Expires: 1967-11-18
Abstract
No abstract record available.
Inventors
- 👤 Herman H Duerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:52
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/407; G03C7/413; G03C5/00; G03C5/26; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN THE PROCESS FO RESTRAINING THE DEVELOPMENT OF THE YELLOW LAYER IN A MULTI-LAYER COLOR FILM OF THE REVERSAL TYPE WHICH INCLUDES EXPOSING SAID FILM, DEVELOPING IT WITH A FIRST DEVELOPING BATH FOR SILVER HALIDE, RE-EXPOSING TO LIGHT, COLOR DEVELOPING AND BLEACHING THE SAME, THE IMPROVEMENT COMPRISING USING AS THE FIRST DEVELOPING BATH AN AQUEOUS DEVELOPING SOLUTION COMPRISING A DEVELOPING AGENT FOR SILVER-HALIDE, POTASSIUM BROMIDE, A SILVER SOLVENT, AND POTASSIUM IODIDE IN AN AMOUNT RANGING FROM 2 TO 12 MGS. PER LITER OF DEVELOPER.
Claim 2
Dependent Claim
84 words
IN THE PROCESS FO RESTRAINING THE DEVELOPMENT OF THE YELLOW LAYER IN A MULTI-LAYER COLOR FILM OF THE REVERSAL TYPE WHICH INCLUDES EXPOSING SAID FILM, DEVELOPING IT WITH A FIRST DEVELOPING BATH FOR SILVER HALIDE, RE-EXPOSING TO LIGHT, COLOR DEVELOPING AND BLEACHING THE SAME, THE IMPROVEMENT COMPRISING USING AS THE FIRST DEVELOPING BATH AN AQUEOUS DEVELOPING SOLUTION COMPRISING A DEVELOPING AGENT FOR SILVER-HALIDE, POTASSIUM BROMIDE, A SILVER SOLVENT, AND POTASSIUM IODIDE IN AN AMOUNT RANGING FROM 2 TO 12 MGS. PER LITER OF DEVELOPER.
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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) | 1954-05-14 | 1954-11-13 | 1955-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-14 | 1958-11-13 | 1959-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-14 | 1962-11-13 | 1963-05-15 | $7700.00 | Window Closed / Lapsed |