US3776728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing offset printing plate
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1972-03-30
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Granted: 1973-12-04
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Expires: 1992-03-30
Abstract
Abstract An offset printing plate of improved printability is provided utilizing the silver complex salt diffusion transfer process by treating an offset master plate containing an image-receiving layer composed of 100 parts by weight of a physical development center and not more than 30 parts by weight of a high-molecularweight compound, with a transfer developer solution consisting essentially of a developing agent, a solvent for a silver halide, and at least one organic heterocyclic compound such as 3-pentylbenzoxazoline-2-thione, 5-phenyl-2-mercapto-1,3,4-oxadiazole or 3-mercapto-4-methyl-5-pentyl-1,2,4-triazole.
Inventors
- 👤 S Suzuki
- 👤 N Kobayashi
- 👤 K Futaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:37
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/24; G03C8/243; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/063; G03F7/066
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
The method of claim 1, wherein said organic compound is selected from the group consisting of 3-pentyl-benzoxazoline-2-thione, 4-benzamide-3-mercapto-5-pentyl-1,2,4-triazole, 3-ethyl-benzothiazoline-2-thione, 5-phenyl-2-mercapto-1,3,4-oxadiazole, 5-propyl-2-mercapto-1,3,4-oxadiazole, 3-methyl-benzothiazoline-2-thione, 5-methyl-2-mercapto-1,3,4-oxadiazole, 3-propyl-benzothiazoline-2-thione, 5-(p-methyl-phenyl)-2-mercapto-1,3,4-oxadiazole, 1-phenyl-5-mercapto-1,2,3,4-tetrazole, 1,3-diethylbenzimidazoline-2-thione, 3-mercapto-4-methyl-5-pentyl-1, 2,4-triazole, 3-mercapto-4-acetamide-5-n-heptyl-1,2,4-triazole, 3,6-dimethyl-benzothiazoline-2-thione, 3-ethyl-6-ethoxy-benzothiazoline-2-thione, 3-mercapto-4-amino-5-n-pentyl-1,2,4-triazole and 1-ethyl-5-mercapto-1,2,3,4-tetrazole.
Claim 2
Dependent Claim
25 words
The method of claim 1, wherein the amount of said organic compound is from 0.05 g to 1.00 g per liter of the developer solution.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein the amount of said developing agent is 3 to 20 g per liter of the developer solution.
Claim 4
Dependent Claim
26 words
The method of claim 1, wherein the amount of said solvent for a silver halide is 5 to 30 g per liter of the developer solution.
Claim 5
Dependent Claim
29 words
The method of claim 1, wherein said developing agent is selected from the group consisting of phenidone, hydroquinone, Metol, pyrogallic acid, Pyramidol, hydramine, amidol, para-amidophenol, protocatechuic acid and pyrocatechin.
Claim 6
Dependent Claim
34 words
The method of claim 1, wherein said solvent for a silver halide is selected from the group consisting of sodium thiosulfate, sodium sulfite, potassium cyanide, thiourea, ammonium thiocyanate, ammonium thiosulfate, sodium thiocyanate, and thiosinamine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |