US4368255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of processing monochrome silver halide material
Assignee: Novartis AG
•
Filing: 1981-07-15
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Granted: 1983-01-11
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Expires: 2001-07-15
Abstract
Abstract A method of processing monochrome silver halide material which contains in at least one silver halide layer in addition to the normal image-forming color coupler or couplers a development inhibitor releasing compound which method comprises developing the exposed material in a color developing solution which comprises not more than 2.5 g/liter of a paraphenylene diamine color developing agent which is able to couple with the color coupler or couplers and D.I.R. compound present, the process further comprising silver halide fixing, silver image bleaching and washing steps. The developed photographic images exhibit a remarkable increase in sharpness.
Inventors
- 👤 Thomas G. Borg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:54
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/407; G03C7/413; G03C7/4136
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A method of processing monochrome silver halide material which contains in at least one silver halide layer in addition to the normal image-forming colour coupler or couplers, a development inhibitor releasing compound which method comprises developing the exposed material in a color developing solution which comprises not more than 2.5 g/liter of a paraphenylene diamine colour developing agent of the formula ##STR20## where R 16 is alkyl having from 1 to 6 carbon atoms or substituted alkyl, R 17 is substituted alkyl, R 18 is hydrogen or alkyl having from 1 to 4 carbon atoms or substituted alkyl, and X is an anion, which colour colour developing agent is able to couple with the colour coupler or couplers and D.I.R. compound present, the D.I. group being an alkyl thiotriazole group of the formula ##STR21## where R 1 is an alkyl group having from 4 to 8 carbon atoms, the process further comprising silver halide fixing, silver image bleaching and washing steps.
Claim 2
Independent Claim
161 words
A method of processing monochrome silver halide material which contains in at least one silver halide layer in addition to the normal image-forming colour coupler or couplers, a development inhibitor releasing compound which method comprises developing the exposed material in a color developing solution which comprises not more than 2.5 g/liter of a paraphenylene diamine colour developing agent of the formula ##STR20## where R 16 is alkyl having from 1 to 6 carbon atoms or substituted alkyl, R 17 is substituted alkyl, R 18 is hydrogen or alkyl having from 1 to 4 carbon atoms or substituted alkyl, and X is an anion, which colour colour developing agent is able to couple with the colour coupler or couplers and D.I.R. compound present, the D.I. group being an alkyl thiotriazole group of the formula ##STR21## where R 1 is an alkyl group having from 4 to 8 carbon atoms, the process further comprising silver halide fixing, silver image bleaching and washing steps.
Claim 3
Dependent Claim
25 words
A method according to claim 1 wherein the concentration of the colour developing agent in the colour developing solution is from 1 to 2.5 g/liter.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein the colour development step is carried out at a temperature above 30° C.
Claim 5
Dependent Claim
19 words
A method according to claim 1 wherein the D.I.R. compound is a colour coupler which releases a D.I. group.
Claim 6
Dependent Claim
15 words
A method according to claim 4 wherein the colour coupler is a yellow colour coupler.
Claim 7
Dependent Claim
27 words
A method according to claim 1 wherein the D.I.R. compound is present in the material at a coating weight of from 0.01 to 0.2 g/m 2 .
Claim 8
Dependent Claim
20 words
A method according to claim 1 wherein the main image forming coupler in the material is a yellow colour coupler.
Claim 9
Dependent Claim
27 words
A method according to claim 1 wherein the main image forming couplers in the material are a yellow colour coupler and a yellowish dye forming colour coupler.
Claim 10
Dependent Claim
17 words
A method according to claim 8 wherein the material also comprises cyan couplers and a magenta coupler.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |