US3615437A
Expired / Lapsed
US
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Lithographic printing plates
Assignee: Eastman Kodak Co
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Filing: 1968-01-02
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Granted: 1971-10-26
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Expires: 1988-01-02
Abstract
Abstract Lithographic printing plates and methods for the preparation thereof wherein an oleophilic metal, e.g. copper, overlayer is selectively electrodeposited on image areas formed by silver salt diffusion transfer on a hydrophilic metal, e.g. aluminum, base. Press life of the metal baseplates is significantly increased by the deposition of the overlayer.
Inventors
- 👤 Peter Charles Richardson
- 👤 Peter John Hillson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:58
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/034; G; G03; G03F; G03F7/00; G03F7/004; G03F7/06; G03F7/063
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
23 words
The lithographic plate of claim 1 wherein said hydrophilic metal base comprises a metal selected from the group consisting of aluminum and zinc.
Claim 2
Dependent Claim
28 words
The lithographic plate of claim 2 wherein the hydrophilic metal base comprises aluminum coated with a thin layer of aluminum oxide and the oleophilic metallic layer comprises copper.
Claim 3
Dependent Claim
14 words
The lithographic plate of claim 2 wherein said oleophilic metallic layer comprises oleophilic copper.
Claim 4
Dependent Claim
14 words
The lithographic plate of claim 2 wherein said oleophilic metallic layer comprises oleophilic nickel.
Claim 5
Dependent Claim
14 words
The lithographic plate of claim 2 wherein said oleophilic metallic layer comprises oleophilic zinc.
Claim 6
Dependent Claim
38 words
The lithographic plate of claim 29 wherein said oleophilic metallic layer is formed by electrodeposition of a metal onto a silver layer followed by contacting said metallic layer with a compound conferring oleophilic properties to said metallic layer.
Claim 7
Independent Claim
57 words
A method for producing lithographic printing plates comprising the steps of: a. forming a silver image on a hydrophilic metallic support by silver salt diffusion transfer; and b. depositing an oleophilic metallic image on said silver image by electrodeposition, said oleophilic metallic image corresponding to the silver image and forming an oleophilic overlayer on the silver image.
Claim 8
Dependent Claim
21 words
The method of claim 8 wherein said metallic support comprises a metal selected from the group consisting of aluminum and zinc.
Claim 9
Dependent Claim
24 words
The method of claim 8 wherein said oleophilic image is composed of a oleophilic metal selected from the group consisting of copper, and nickel.
Claim 10
Independent Claim
80 words
A method for producing lithographic printing plates comprising the steps of a. forming a silver image on a hydrophilic metallic support by silver salt diffusion transfer; b. depositing a metallic image on said silver image by electrodeposition, said metallic image corresponding to the silver image and forming an overlayer on the silver image; and c. treating said metallic image to render said metallic image oleophilic by contacting said metallic image with a compound conferring oleophilic properties to said metallic image.
Claim 11
Dependent Claim
22 words
The method of claim 11 wherein said metallic support comprises a hydrophilic metal selected from the group consisting of aluminum and zinc.
Claim 12
Dependent Claim
24 words
The method of claim 11 wherein said metallic image is composed of a metal selected from the group consisting of copper, nickel and zinc.
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 |