US4020762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser imaging a lanographic printing plate
Assignee: Warren SD Co
•
Filing: 1975-10-14
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Granted: 1977-05-03
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Expires: 1995-10-14
Abstract
Abstract A planographic printing plate which is imaged by means of a laser beam in combination with overall exposure to ultraviolet light and developed by means which are conventional in lithographic art.
Inventors
- 👤 John O. H. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:41
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/10; B41C1/1008; B41C1/1033; B41C2210/00; B41C2210/04; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
The method of making an imaged printing plate comprising the steps of: (a) providing a planographic printing plate which comprises, on a substrate, a layer which contains an organic-solvent-soluble negative working diazo compound, carbon particles and a self-oxidating binder; (b) selectively removing areas of said layer by means of a laser beam so as to define on the plate an image which is sensitive to ultraviolet light; (c) exposing the plate overall to ultraviolet light; and (d) developing the plate to cause the image areas struck by laser beam to accept ink and the non-image areas to accept water.
Claim 2
Independent Claim
99 words
The method of making an imaged printing plate comprising the steps of: (a) providing a planographic printing plate which comprises, on a substrate, a layer which contains an organic-solvent-soluble negative working diazo compound, carbon particles and a self-oxidating binder; (b) selectively removing areas of said layer by means of a laser beam so as to define on the plate an image which is sensitive to ultraviolet light; (c) exposing the plate overall to ultraviolet light; and (d) developing the plate to cause the image areas struck by laser beam to accept ink and the non-image areas to accept water.
Claim 3
Dependent Claim
17 words
The method in accordance with claim 1 wherein the laser beam is provided by a YAG laser.
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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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |