US3615484A
Expired / Lapsed
US
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Two-component diazo-type photoprinting material for use in wet development
Assignee: Ricoh Co Ltd
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Filing: 1967-12-06
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Granted: 1971-10-26
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Expires: 1987-12-06
Abstract
Abstract A two-component diazo-type photoprinting material which is developed with an alkaline aqueous solution containing no coupler, said photoprinting material comprising a supporting sheet and a light-sensitive layer provided on one face of said supporting sheet, said light-sensitive layer containing at least one aromatic diazo compounds and a coupler consisting of at least one aromatic compound adapted to couple to said diazo compound, said coupler being used with the ratio of 0.5- 1.5 mols to 1 mol of said diazo compound.
Inventors
- 👤 Shigeaki Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:05
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/58
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
31 words
A two-component diazotype photoprinting material for wet development according to claim 1, wherein said light-sensitive layer further contains an acid stabilizer and an agent adapted to prevent the running of ink.
Claim 2
Dependent Claim
15 words
treating the material with an aqueous alkaline solution free of coupler to dEvelop an image.
Claim 3
Dependent Claim
63 words
A two-component diazotype photoprinting material for wet development according to claim 2, wherein said acid stabilizer is a substance selected from the group consisting of oxalic acid, sulfuric acid, tartaric acid, citric acid, maleic acid and boric acid, and said agent adapted to prevent the running of ink is a substance selected from the group consisting of thiourea, cadmium sulfate and cadmium chloride.
Claim 4
Dependent Claim
20 words
A two-component diazotype photoprinting material for wet development according to claim 1, wherein said supporting sheet has a precoated surface.
Claim 5
Independent Claim
10 words
A method of making photoprints, which comprises the steps of
Claim 6
Dependent Claim
33 words
A method according to claim 5, in which the aqueous alkaline solution is selected from the group consisting of aqueous solutions of potassium carbonate, potassium hydroxide, sodium carbonate, potassium metaborate and potassium tetraborate.
Claim 7
Dependent Claim
24 words
A method according to claim 5, in which the pH of the aqueous alkaline solution is in the range of about 11.5 to 12.0.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |