US2663641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of reversal images
Assignee: Gevaert Photo Producten NV
•
Filing: 1947-09-30
•
Granted: 1953-12-22
•
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 13:59
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.
References Cited (Backward Citations)
US1303635A
Cited
US1285015A
Cited
GB247169A
Cited
US1753059A
Cited
US2000353A
Cited
FR716428A
Cited
US1849245A
Cited
US1930140A
Cited
US2001951A
Cited
FR873507A
Cited
FR879995A
Cited
US2352014A
Cited
US2397016A
Cited
US2440106A
Cited
US2543181A
Cited
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 |