Patent EP0046771A1 successfully refreshed from Google Patents.
US4475460A
Expired / Lapsed
US
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Process for desensitizing lithographic printing plates
Assignee: Fujifilm Holdings Corp
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Filing: 1983-10-05
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Granted: 1984-10-09
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Expires: 2003-10-05
Abstract
Abstract A process for desensitizing lithographic printing plates is described. The gum for the process comprises an aqueous solution containing a film-forming starch derivative modified with polyoxyethylene or a polyoxyethylene-polyoxypropylene copolymer. The gum reduces the number of spoiled copies printed and the amount of staining on non-image areas.
Inventors
- 👤 Hiroshi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:49
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
41 words
A process for desensitizing a lithographic printing plate having a hydrophilic non-image area and a lipophilic image area comprising coating said plate with a desensitizing gum comprising an aqueous solution containing a film-forming starch modified with polyoxyethylene or a polyoxyethylene-polyoxypropylene copolymer.
Claim 2
Dependent Claim
41 words
A process for desensitizing a lithographic printing plate having a hydrophilic non-image area and a lipophilic image area comprising coating said plate with a desensitizing gum comprising an aqueous solution containing a film-forming starch modified with polyoxyethylene or a polyoxyethylene-polyoxypropylene copolymer.
Claim 3
Dependent Claim
29 words
The process of claim 1, wherein said starch is selected from the group consisting of potato starch, sweet potato starch, wheat starch, corn starch, tapioca starch and rice starch.
Claim 4
Dependent Claim
42 words
The process of claim 1, wherein the degree of modification of the starch with polyoxyethylene or polyoxyethylene-polyoxypropylene copolymer is conducted to such degree that the resulting modified starch has a solubility of 5 wt % or more in water at 20° C.
Claim 5
Dependent Claim
43 words
The process of claim 1, wherein the degree of modification of the starch with polyoxyethylene or polyoxyethylene-polyoxypropylene copolymer is conducted to such a degree that the resulting modified starch has a solubility of 10 wt % or more in water at 20° C.
Claim 6
Dependent Claim
30 words
The process of claim 1, wherein the content of the polyoxyethylene or polyoxyethylene-polyoxypropylene copolymer-modified starch in the desensitizing gum is in a range of from 5 to 35 wt %.
Claim 7
Dependent Claim
30 words
The process of claim 1, wherein the content of the polyoxyethylene or polyoxyethylene-polyoxypropylene copolymer-modified starch in the desensitizing gum is in a range of from 10 to 25 wt %.
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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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |