Patent US4568303A successfully refreshed from Google Patents.
Patent US3787215A successfully refreshed from Google Patents.
US3787215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material with bleachable dye
Assignee: Ilford Imaging Switzerland GmbH
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Filing: 1972-01-27
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Granted: 1974-01-22
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Expires: 1992-01-27
Abstract
Abstract WHEREIN A, K, B, M, X and Z each denotes an aromatic residue, the residues A-N N-B-NH-CO- and K-N N-M-NH-CO contain groups which confer solubility in water, and Y denotes a water solubility imparting bridging group consisting of at most 4 members. Above all this photographic material is suitable for the silver dyestuff bleaching process and the dyestuffs are incorporated therein mainly as yellow, magenta or cyan image dyestuffs. Photographic, light-sensitive material is provided which contains on a support at least one silver halide layer and at least one layer containing a dyestuff of the formula
Inventors
- 👤 B Piller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:35
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B43/136; C09B43/145; G; G03; G03C; G03C7/00; G03C7/28; G03C7/29
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
19 words
Photographic material as claimed in claim 1 in which at least one layer contains a dyestuff of the formula
Claim 2
Dependent Claim
19 words
Photographic material as claimed in claim 1 in which at least one layer contains a dyestuff of the formula
Claim 3
Dependent Claim
19 words
Photographic material as claimed in claim 1 in which at least one layer contains a dyestuff of the formula
Claim 4
Dependent Claim
19 words
Photographic material as claimed in claim 1 in which at least one layer contains a dyestuff of the formula
Claim 5
Dependent Claim
19 words
Photographic material as claimed in claim 1 in which at least one layer contains a dyestuff of the formula
Claim 6
Dependent Claim
19 words
Photographic material as claimed in claim 6 in which at least one layer contains a dyestuff of the formula
Claim 7
Dependent Claim
19 words
Photographic material as claimed in claim 1 in which at least one layer contains a dyestuff of the formula
Claim 8
Dependent Claim
19 words
Photographic material as claimed in claim 1 in which at least one layer contains a dyestuff of the formula
Claim 9
Dependent Claim
19 words
Photographic material as claimed in claim 1 in which at least one layer contains a dyestuff of the formula
Claim 10
Dependent Claim
19 words
Photographic material as claimed in claim 1 in which at least one layer contains a dyestuff of the formula
Claim 11
Dependent Claim
14 words
Photographic material as claimed in claim 1 suitable for the silver dyestuff bleaching process.
Claim 12
Dependent Claim
19 words
Photographic material as claimed in claim 1, in which the dyestuff is in a layer also containing silver halide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |