US3767402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic colour material
Assignee: Ilford Imaging Switzerland GmbH
•
Filing: 1971-08-31
•
Granted: 1973-10-23
•
Expires: 1991-08-31
Abstract
Abstract A photographic light-sensitive material for the silver bleaching process which comprises on a support in at least one layer a quinoxaline of formula WHEREIN A1 and A2 are each an alkyl-, aralkyl-, aryl, or heterocyclic group and n is 1 or 2, whereby the oxygen-containing ring is connected with the quinoxaline group in the 5,6- or 6,7position as a colour bleaching catalyst as well as quinoxalines of the formula given above are disclosed.
Inventors
- 👤 H Schlunke
- 👤 C Egli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:23
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/02; C07D491/04; C07D317/00; C07D317/08; C07D317/44; C07D317/46; C07D317/48; C07D317/62; C07D317/66; C09; C09B; C09B35/00; C09B35/02; G; G03; G03C; G03C7/00; G03C7/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
12 words
Photographic material according to claim 1, which comprises a quinoxaline of formula
Claim 2
Dependent Claim
12 words
Photographic material according to claim 2, which comprises a quinoxaline of formula
Claim 3
Dependent Claim
12 words
Photographic material according to claim 3, which comprises a quinoxaline of formula
Claim 4
Dependent Claim
12 words
Photographic material according to claim 4, which comprises a quinoxaline of formula
Claim 5
Dependent Claim
68 words
A process for producing a colour photographic image by the silver dye-bleach process using a material which carries on a substrate, at least one silver halide emulsion layer with a bleachable image dye, by exposing the material, developing the silver image and colour bleaching the image dye in accordance therewith, characterised in that the colour bleaching is performed in the presence of at least one quinoxaline of formula
Claim 6
Dependent Claim
17 words
Process according to claim 6, characterised in that as the colour bleaching catalyst a quinoxaline of formula
Claim 7
Dependent Claim
17 words
Process according to claim 7, characterised in that as the colour bleaching catalyst a quinoxaline of formula
Claim 8
Dependent Claim
17 words
Process according to claim 8, characterised in that as the colour bleaching catalyst a quinoxaline of formula
Claim 9
Dependent Claim
17 words
Process according to claim 9, characterised in that as the colour bleaching catalyst a quinoxaline of formula
Claim 10
Dependent Claim
16 words
Process according to claim 6, characterised in that the quinoxaline is in the colour bleaching bath.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |