US4480549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic printing plate
Assignee: Nippon Paint Co Ltd
•
Filing: 1982-12-30
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Granted: 1984-11-06
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Expires: 2002-12-30
Abstract
Abstract A lithographic printing plate which comprises: (a) a support comprising an iron foil prepared by electroforming, wherein one surface of said foil is in contact with an electrolyte and the opposite surface is in contact with a negative electrode, said foil being electroplated with a hydrophilic metal on both surfaces, and (b) an oleophilic image area formed from a photo-sensitive resin on said surface of the hydrophilic metal coated iron foil, which was in contact with said electrolyte and a non-image area where said resin is not present on said surface of said hydrophilic metal coated iron foil which was in contact with said electrolyte, said non-image area exhibiting good hydrophilic and water retentive properties in lithographic printing.
Inventors
- 👤 Kiyomi Sakurai
- 👤 Seiji Arimatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:33
CPC Classifications
B; B41; B41N; B41N1/00; B41N1/04; B41N1/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431; Y10T428/12438; Y10T428/12993
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
A lithographic printing plate which comprises: (a) a support comprising an iron foil prepared by electroforming, wherein one surface of said foil is in contact with an electrolyte and the opposite surface is in contact with a negative electrode, said surface in contact with said electrolyte having a relatively rough surface compared to said surface in contact with said negative electrode and wherein the porosity of said surface in contact with said electrolyte is about 4˜8.5μ, said foil being electroplated with a hydrophilic metal on both surfaces to form a hydrophilic metal layer sufficiently thin as to substantially retain the porosity of the iron foil, and (b) an oleophilic image area formed from a photosensitive resin on said surface of the hydrophilic metal coated iron foil, which was in contact with said electrolyte and a non-image area where said resin is not present on said surface of said hydrophilic metal coated iron foil which was in contact with said electrolyte, said non-image area exhibiting good hydrophilic and water retentive properties in lithographic printing.
Claim 2
Dependent Claim
173 words
A lithographic printing plate which comprises: (a) a support comprising an iron foil prepared by electroforming, wherein one surface of said foil is in contact with an electrolyte and the opposite surface is in contact with a negative electrode, said surface in contact with said electrolyte having a relatively rough surface compared to said surface in contact with said negative electrode and wherein the porosity of said surface in contact with said electrolyte is about 4˜8.5μ, said foil being electroplated with a hydrophilic metal on both surfaces to form a hydrophilic metal layer sufficiently thin as to substantially retain the porosity of the iron foil, and (b) an oleophilic image area formed from a photosensitive resin on said surface of the hydrophilic metal coated iron foil, which was in contact with said electrolyte and a non-image area where said resin is not present on said surface of said hydrophilic metal coated iron foil which was in contact with said electrolyte, said non-image area exhibiting good hydrophilic and water retentive properties in lithographic printing.
Claim 3
Dependent Claim
32 words
The lithographic printing plate according to claim 1, wherein the iron foil is laminated with a reinforming sheet on the surface which was in contact with the negative electrode during the electroforming.
Claim 4
Dependent Claim
24 words
The lithographic printing plate according to claim 2, wherein the reinforcing sheet is made of paper, cloth, non-woven cloth, plastic resin or synthetic paper.
Claim 5
Dependent Claim
17 words
The lithographic printing plate according to claim 1, wherein the hydrophilic metal is zinc, chromium or nickel.
Claim 6
Dependent Claim
20 words
The lithographic printing plate according to claim 1, wherein the iron foil has a thickness of 0.003 to 0.150 mm.
Claim 7
Dependent Claim
23 words
The lithographic plate according to claim 1 wherein the roughness of the surface in contact with the negative electrode is 1 to 2μ.
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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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |