US3223527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of photographic images by the silver dyestuff bleaching process and photographic layers therefor
Assignee: BASF Corp
•
Filing: 1961-05-09
•
Granted: 1965-12-14
•
Expires: 1981-05-09
Abstract
No abstract record available.
Inventors
- 👤 Dreyfuss Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:00
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/28; G03C7/29; C; C09; C09B; C09B39/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
IN A PROCESS FOR THE PRODUCTION OF COLOR PHOTOGRAPHIC IMAGES BY THE SILVER DYESTUFF BLEACHING METHOD, THE STEP WHICH COMPRISES DECREASING THE CONTRAST OBTAINED BY BLEACHING AT LEAST ONE OF THE DYESTUFFS SERVING FOR IMAGE FORMATION BY MEANS OF A SUPPLEMENTARY DYESTUFF WHICH CORRESPONDS TO THE FORMULA
Claim 2
Dependent Claim
47 words
IN A PROCESS FOR THE PRODUCTION OF COLOR PHOTOGRAPHIC IMAGES BY THE SILVER DYESTUFF BLEACHING METHOD, THE STEP WHICH COMPRISES DECREASING THE CONTRAST OBTAINED BY BLEACHING AT LEAST ONE OF THE DYESTUFFS SERVING FOR IMAGE FORMATION BY MEANS OF A SUPPLEMENTARY DYESTUFF WHICH CORRESPONDS TO THE FORMULA
References Cited (Backward Citations)
US2020775A
Cited
US2219305A
Cited
US2348894A
Cited
US2221793A
Cited
US2296843A
Cited
US2304987A
Cited
US3053655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |