US3677178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry planographic plates and methods, production and use
Assignee: Warren SD Co
•
Filing: 1968-02-19
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Granted: 1972-07-18
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Expires: 1988-02-19
Abstract
Abstract A new ''''dry planographic'''' plate comprised of a flexible substrate having coated thereon a cured solid but elastic silicone rubber film which will not remove conventional lithographic ink from an ink roller on a printing press, a method of producing this plate and a new ''''dry planographic'''' process wherein the new planographic plate of the present invention is not wet with a fountain solution.
Inventors
- 👤 Harry F Gipe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:16
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/003; G; G03; G03F; G03F7/00; G03F7/004; G03F7/04; G03F7/075; G03F7/0752; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
A dry printing plate comprising a base layer having sufficient strength to withstand the stresses normally produced by a printing process, a layer of silicone rubber material overlying said base layer, and a continuous chemically etchable metallic layer mounted on the outside surface of the silicone rubber layer and capable of being etched away in selected areas so as to define the boundaries of an image to be printed from said plate, said silicone rubber material being adapted in the absence of dampening to provide an ink repellent background for said image.
Claim 2
Dependent Claim
17 words
The printing plate of claim 1 wherein said second layer overlies said layer of silicone rubber material.
Claim 3
Dependent Claim
22 words
The printing plate of claim 1 wherein said second layer is between said layer of silicone rubber material and said base layer.
Claim 4
Dependent Claim
92 words
A dry planographic printing plate comprising a base layer and at least two additional layers disposed in superimposed relation to each other and both overlying said base layer, one of said additional layers being a layer of silicone rubber material, and another of said additional layers being light sensitive and capable of being removed in selected areas so as to define the boundaries of an image to be printed from said plate, said silicone rubber material being adapted in the absence of dampening to provide an ink repellent background for said image.
Claim 5
Dependent Claim
18 words
The printing plate of claim 5 wherein said light sensitive layer overlies said layer of silicone rubber material.
Claim 6
Dependent Claim
23 words
The printing plate of claim 5 wherein said light sensitive layer is between said layer of silicone rubber material and said base layer.
Claim 7
Dependent Claim
47 words
An imaged dry planographic printing plate, which accepts ink in the image area and prints therefrom, and repels ink in the non-image area, comprising a base layer, an ink-receptive image area, and a silicone rubber material overlying said base layer and providing the ink repellent non-image area.
Claim 8
Dependent Claim
105 words
A process for printing planographically in the absence of dampening with an imaged dry planographic printing plate which accepts ink in the image area and prints therefrom and which repels ink in the non-image area, which process comprises rolling the surface of the imaged dry planographic printing plate with ink in the absence of dampening whereby the ink is contacted with the image and the non-image areas of the plate, the ink being repelled in the non-image area by a silicone rubber material and the ink being accepted in the image area, and thereafter transferring ink accepted in the image area to an ink-receptive surface.
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |