Patent US2663641A successfully refreshed from Google Patents.
US2663641A
Expired / Lapsed
US
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Production of reversal images
Assignee: Gevaert Photo Producten NV
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Filing: 1947-09-30
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Granted: 1953-12-22
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Expires: 1967-09-30
Abstract
No abstract record available.
Inventors
- 👤 Rott Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:40
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
PROCESS FOR THE PRODUCTION OF A PHOTOGRAPHIC REVERSAL IMAGE IN A PHOTOGRAPHIC MATERIAL CONTAINING TWO LAYERS SPREAD ON THE SAME SUPPORT, THE TOP LAYER BEING AN UNHARDENED LIGHT-SENSITIVE SILVER HALIDE GELATINE EMULSION LAYER, THE BOTTOM LAYER BEING A HARDENED RECEIVING LAYER, WHICH COMPRISES EXPOSING SAID LIGHT-SENSITIVE LAYER TO LIGHT TREATING THE SO EXPOSED MATERIAL WITH A SILVER HALIDE DEVELOPER TO DEVELOP THE EXPOSED SILVER HALIDE AND THEN TREATING THE SAID MATERIAL CONTAINING SILVER HALIDE DEVELOPER WITH AN AQUEOUS SOLUTION OF A THIOSULPHATE AND GELATINE SOLVENT SELECTED FROM THE GROUP CONSISTING OF THIOCYANATES AND ORGANIC SULPHONIC ACIDS, SAID SOLVENT BEING PRESENT IN A CONCENTRATION OF APPROXIMATELY 100 GRAMS PER LITER.
Claim 2
Dependent Claim
109 words
PROCESS FOR THE PRODUCTION OF A PHOTOGRAPHIC REVERSAL IMAGE IN A PHOTOGRAPHIC MATERIAL CONTAINING TWO LAYERS SPREAD ON THE SAME SUPPORT, THE TOP LAYER BEING AN UNHARDENED LIGHT-SENSITIVE SILVER HALIDE GELATINE EMULSION LAYER, THE BOTTOM LAYER BEING A HARDENED RECEIVING LAYER, WHICH COMPRISES EXPOSING SAID LIGHT-SENSITIVE LAYER TO LIGHT TREATING THE SO EXPOSED MATERIAL WITH A SILVER HALIDE DEVELOPER TO DEVELOP THE EXPOSED SILVER HALIDE AND THEN TREATING THE SAID MATERIAL CONTAINING SILVER HALIDE DEVELOPER WITH AN AQUEOUS SOLUTION OF A THIOSULPHATE AND GELATINE SOLVENT SELECTED FROM THE GROUP CONSISTING OF THIOCYANATES AND ORGANIC SULPHONIC ACIDS, SAID SOLVENT BEING PRESENT IN A CONCENTRATION OF APPROXIMATELY 100 GRAMS PER LITER.
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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) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |