Patent US4054094A successfully refreshed from Google Patents.
US4054094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser production of lithographic printing plates
Assignee: EIDP Inc
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Filing: 1973-12-19
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Granted: 1977-10-18
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Expires: 1993-12-19
Abstract
Abstract The use of a laser beam to etch the surface of a printing plate made from a polymer composition on a metal or plastic base and a thin top coating of a hard hydrophilic material produces a lithographic printing plate capable of accepting ink in the etched region and accepting water in the unetched regions.
Inventors
- 👤 Jack R. Caddell
- 👤 Harvey H. Hoehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:59
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/03; B41N3/038; B41C; B41C1/00; B41C1/10; B41C1/1008; B41C1/1033; B41C2201/00; B41C2201/04; B41C2210/00; B41C2210/02; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
153 words
A process for making a lithographic printing plate, the imaging portion of which comprises a metallic surface which comprises the steps of: a. providing a plate comprising an aluminum base, a thin coating of an organic polymeric composition comprising materials selected from the group conisting of polyester, polymethyl methacrylate and polyoxymethylene, disposed on one surface of said aluminum base, and a thin coating of poly silicic acid, disposed on the exposed surface of said organic polymeric composition; b. removing a portion of the polysilicic acid and the organic polymeric composition to expose the aluminum base by subjecting the plate to a focused laser beam having an intensity sufficient to burn through the polysilicic acid and organic polymeric composition without substantially melting said aluminum base; and c. varying in a controlled manner, the point at which the laser beam impinges on said plate so that a predetermined pattern can be engraved on said plate.
Claim 2
Dependent Claim
153 words
A process for making a lithographic printing plate, the imaging portion of which comprises a metallic surface which comprises the steps of: a. providing a plate comprising an aluminum base, a thin coating of an organic polymeric composition comprising materials selected from the group conisting of polyester, polymethyl methacrylate and polyoxymethylene, disposed on one surface of said aluminum base, and a thin coating of poly silicic acid, disposed on the exposed surface of said organic polymeric composition; b. removing a portion of the polysilicic acid and the organic polymeric composition to expose the aluminum base by subjecting the plate to a focused laser beam having an intensity sufficient to burn through the polysilicic acid and organic polymeric composition without substantially melting said aluminum base; and c. varying in a controlled manner, the point at which the laser beam impinges on said plate so that a predetermined pattern can be engraved on said plate.
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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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |