US3877949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material for the silver dyestuff bleaching process
Assignee: Ilford Imaging Switzerland GmbH
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Filing: 1973-09-20
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Granted: 1975-04-15
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Expires: 1993-09-20
Abstract
Abstract This invention relates to photographic material for the silver dyestuff bleaching process. The material contains new yellow trisazo dyestuffs as image dyestuffs. The trisazo dyestuffs are obtainable by condensing in the molecular ratio 2:1 an aminomonoazodyestuff with an asymmetrically built azo compound containing two carboxylic acid chloride groups.
Inventors
- 👤 Alfred Frohlich
- 👤 Hansrolf Loeffel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:16
CPC Classifications
C; C09; C09B; C09B33/00; C09B33/18; C09B33/22; C09B43/00; G; G03; G03C; G03C7/00; G03C7/28; G03C7/29
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
32 words
PHOTOGRAPHIC MATERIAL FOR THE SILVER DYESTUFF BLEACHING PROCESS THAT CONTAINS ON A SUPPORT AT LEAST ONE SILVER HALIDE EMULSION LAYER AND IN AT LEAST ONE LAYER A TRISAZO DYESTUFF OF THE FORMULA
Claim 2
Dependent Claim
32 words
PHOTOGRAPHIC MATERIAL FOR THE SILVER DYESTUFF BLEACHING PROCESS THAT CONTAINS ON A SUPPORT AT LEAST ONE SILVER HALIDE EMULSION LAYER AND IN AT LEAST ONE LAYER A TRISAZO DYESTUFF OF THE FORMULA
Claim 3
Dependent Claim
22 words
Photographic materiaL according to claim 1 that contains on a support at least one layer containing a trisazo dyestuff of the formula
Claim 4
Dependent Claim
22 words
Photographic material according to claim 1 that contains on a support at least one layer containing a trisazo dyestuff of the formula
Claim 5
Dependent Claim
22 words
Photographic material according to claim 1 that contains on a support at least one layer containing a trisazo dyestuff of the formula
Claim 6
Dependent Claim
17 words
Photographic material according to claim 1 that contains on a support the trisazo dyestuff of the formula
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |