US3178290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic layers suitable for the silver dyestuff bleaching method
Assignee: BASF Schweiz AG
•
Filing: 1961-07-13
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Granted: 1965-04-13
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Expires: 1981-07-13
Abstract
No abstract record available.
Inventors
- 👤 Anderau Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:19
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/136; C09B43/14; C09B45/00; C09B45/02; C09B45/24; G; G03; G03C; G03C7/00; G03C7/28; G03C7/29
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER FOR THE SILVER DYESTUFF BLEACHING PROCESS, WHICH LAYER IS COLORED WITH A COMPLEX COPPER COMPOUND OF AN AZO-DYESTUFF OF THE FORMULA
Claim 2
Dependent Claim
27 words
A PHOTOGRAPHIC SILVER HALIDE EMULSION LAYER FOR THE SILVER DYESTUFF BLEACHING PROCESS, WHICH LAYER IS COLORED WITH A COMPLEX COPPER COMPOUND OF AN AZO-DYESTUFF OF THE FORMULA
References Cited (Backward Citations)
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US1300616A
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US1940066A
Cited
US2304884A
Cited
US2294892A
Cited
US2418624A
Cited
US2612448A
Cited
US3038802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |