Patent US3960567A successfully refreshed from Google Patents.
US3960567A
Expired / Lapsed
US
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Process and composition for producing photolithographic plate for the graphic arts
Assignee: Fujifilm Holdings Corp
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Filing: 1974-10-07
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Granted: 1976-06-01
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Expires: 1994-10-07
Abstract
Abstract An infectious developer composition comprising (a) at least one of dihydroxybenzene derivative, (b) an antioxidant (c) an alkali agent and (d) a viscosity increasing agent is disclosed, a process for producing a photolithographic plate is also disclosed.
Inventors
- 👤 Katsumi Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:14
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/261; G03C5/29; G03C5/305
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
In a process for producing a photolithographic plate for the graphic arts which comprises imagewise exposing and then developing a silver halide photographic material with an infectious developer composition having a pH higher than 8 and comprising (a) at least one member selected from the group consisting of hydroquinone and hydroquinone derivatives wherein said at least one member is the sole developing agent in said infectious developer composition, (b) an aldehyde-bisulfite addition product, (c) an alkai agent and (d) free sulfite ions, the improvement which comprises including a viscosity increasing agent selected from the group consisting of carboxymethyl cellulose, hydroxyethyl cellulose, sodium alginate, methyl cellulose, polyvinyl alcohol and methylvinyl ether-maleic anhydride copolymer; said developer composition having a viscosity of from about 1,000 to 200,000 centipoises at 25°C.
Claim 2
Dependent Claim
127 words
In a process for producing a photolithographic plate for the graphic arts which comprises imagewise exposing and then developing a silver halide photographic material with an infectious developer composition having a pH higher than 8 and comprising (a) at least one member selected from the group consisting of hydroquinone and hydroquinone derivatives wherein said at least one member is the sole developing agent in said infectious developer composition, (b) an aldehyde-bisulfite addition product, (c) an alkai agent and (d) free sulfite ions, the improvement which comprises including a viscosity increasing agent selected from the group consisting of carboxymethyl cellulose, hydroxyethyl cellulose, sodium alginate, methyl cellulose, polyvinyl alcohol and methylvinyl ether-maleic anhydride copolymer; said developer composition having a viscosity of from about 1,000 to 200,000 centipoises at 25°C.
Claim 3
Dependent Claim
16 words
The process of claim 1, wherein said infectious developer composition further comprises (d) an antifogging agent.
Claim 4
Dependent Claim
29 words
The process of claim 1, wherein said silver halide photographic material comprises a suppot having thereon a silver halide emulsion layer containing more than 50 mol% of silver chloride.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein said viscosity increasing agent is present in said composition at a level of from 0.1 to 5% weight.
Claim 6
Dependent Claim
38 words
The process of claim 1, wherein said aldehyde-bisulfite addition product serves as a source of free sulfite ions and is present in an amount of from about 13 to 130 g. per liter of the infectious developer composition.
Claim 7
Dependent Claim
106 words
In an infectious developer composition for lithographic development having a pH higher than 8 and comprising (a) at least one member selected from the group consisting of hydroquinone and hydroquinone derivatives wherein said at least one member is the sole developing agent in said infectious developer composition, (b) an aldehyde-bisulfite addition product (c) an alkali agent and (d) free sulfite ions, the improvement which comprises including a viscosity increasing agent selected from the group consisting of carboxymethyl cellulose, hydroxyethyl cellulose, sodium alginate, methyl cellulose, polyvinyl alcohol and methylvinyl ethermaleic anhydride copolymer; said developer composition having a viscosity of from about 1,000 to 200,000 centipoises at 25°C.
Claim 8
Dependent Claim
106 words
In an infectious developer composition for lithographic development having a pH higher than 8 and comprising (a) at least one member selected from the group consisting of hydroquinone and hydroquinone derivatives wherein said at least one member is the sole developing agent in said infectious developer composition, (b) an aldehyde-bisulfite addition product (c) an alkali agent and (d) free sulfite ions, the improvement which comprises including a viscosity increasing agent selected from the group consisting of carboxymethyl cellulose, hydroxyethyl cellulose, sodium alginate, methyl cellulose, polyvinyl alcohol and methylvinyl ethermaleic anhydride copolymer; said developer composition having a viscosity of from about 1,000 to 200,000 centipoises at 25°C.
Claim 9
Dependent Claim
25 words
The composition of claim 6, wherein said viscosity increasing agent is present in said composition at a level of from 0.1 to 5% by weight.
Claim 10
Dependent Claim
11 words
The composition of claim 6 further comprising an aldehyde bisulfite-addition product.
Claim 11
Dependent Claim
40 words
The composition of claim 8, wherein said aldehydebisulfite addition product is a source of free sulfite ions in said composition, and said aldehyde-bisulfite addition product is present in an amount of from about 13 to 130 g./liter of said composition.
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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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |