US3647466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material for the silver dyestuff bleaching process
Assignee: BASF Schweiz AG
•
Filing: 1969-08-21
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Granted: 1972-03-07
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Expires: 1989-08-21
Abstract
Abstract Photographic material for the silver dyestuff bleaching process is provided wherein at least one silver halide emulsion layer, containing a bleachable azo dyestuff as the image dyestuff also contains a benzselenazole-benzelenazole or benselenazolebenzthiazole carbocyanine as red-sensitizer. This photographic material is characterized by an unexpectedly high relative sensitivity, especially in the presence of polyazo dyestuffs.
Inventors
- 👤 Heinrich Bruengger
- 👤 Carlo Boragine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:55
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/02; C09B23/06; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14; G03C1/18; G03C7/00; G03C7/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
12 words
Photographic material as claimed in claim 1, in which A is ethyl.
Claim 2
Dependent Claim
7 words
Photographic material as claimed in claim 1,
Claim 3
Dependent Claim
13 words
Photographic material as claimed in claim 1, which contains a red-sensitizer of formula
Claim 4
Dependent Claim
13 words
Photographic material as claimed in claim 4, which contains a red-sensiTizer of formula
Claim 5
Dependent Claim
7 words
Photographic material as claimed in claim 5,
Claim 6
Dependent Claim
13 words
Photographic material as claimed in claim 5, which contains a red-sensitizer of formula
Claim 7
Dependent Claim
13 words
Photographic material as claimed in claim 1, which contains a red-sensitizer of formula
Claim 8
Dependent Claim
13 words
Photographic material as claimed in claim 1, which contains a red-sensitizer of formula
Claim 9
Dependent Claim
13 words
Photographic material as claimed in claim 1, which contains a red-sensitizer of formula
Claim 10
Dependent Claim
13 words
Photographic material as claimed in claim 1, which contains a red-sensitizer of formula
References Cited (Backward Citations)
US2503776A
Cited
US3157507A
Cited
US3058978A
Cited
US3255012A
Cited
US3354170A
Cited
US3348949A
Cited
US3410848A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |