US4086092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making photosensitive lithographic printing plates involving sequentially coating with potassium zirconium fluoride and sodium silicate
Assignee: Polychrome Corp
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Filing: 1977-04-18
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Granted: 1978-04-25
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Expires: 1997-04-18
Abstract
Abstract A method for preparing aluminum based lithographic printing plates which comprises coating at least one surface of an aluminum base sheet with a potassium zirconium fluoride solution, thereafter treating the coated, aluminum plate with a stratum of a sodium silicate solution and then applying to said surface a lithographically suitable light sensitive composition to yield the desired photosensitive lithographic printing plate of improved characteristics.
Inventors
- 👤 Eugene Golda
- 👤 Alan Leonard Wilkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:10
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/039; B; B41; B41N; B41N3/00; B41N3/03; B41N3/038; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
A method for preparing lithographic printing plates which comprises first coating at least one surface of a metal sheet substrate with an aqueous solution of potassium zirconium fluoride, subsequently treating the coated substrate with an aqueous solution of sodium silicate and then applying to the thus treated substrate a lithographically suitable photosensitive composition.
Claim 2
Independent Claim
53 words
A method for preparing lithographic printing plates which comprises first coating at least one surface of a metal sheet substrate with an aqueous solution of potassium zirconium fluoride, subsequently treating the coated substrate with an aqueous solution of sodium silicate and then applying to the thus treated substrate a lithographically suitable photosensitive composition.
Claim 3
Dependent Claim
11 words
The lithographic printing plate obtained by the method of claim 1.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the metal sheet substrate is comprised of aluminum.
Claim 5
Dependent Claim
12 words
The method of claim 3 wherein the aluminum substrate has been grained.
Claim 6
Dependent Claim
12 words
The method of claim 3 wherein the aluminum substrate has been anodized.
Claim 7
Dependent Claim
12 words
The method of claim 4 wherein the aluminum substrate has been anodized.
Claim 8
Dependent Claim
45 words
The method of claim 1 wherein the photosensitive composition contains a photosensitizing agent selected from the group consisting of aromatic diazo compounds, azidopyrenes, benzoquinone diazides, naphthoquinone diazides, polyacetals which depolymerize under ultraviolet radiation, polymonochloroacetaldehyde, polypropionaldehyde, poly-n-butyraldehyde, poly-cyano-acetaldehyde, poly-B-cyanopripionaldehyde, poly-cyano-pentaldehyde, polycycnovaleraldehyde, poly-n-butyraldehyde, poly-isobutyraldehyde, polyvaleraldehyde and polyheptaldehyde.
Claim 9
Dependent Claim
52 words
The method of claim 1 wherin said metal sheet substrate is coated with an aqueous potassium zirconium fluoride solution having a concentration of from about 0.1% to about 5.0% by weight, maintained at a temperature of from about 70° to about 210° F for from about 10 seconds to about 5 minutes.
Claim 10
Dependent Claim
50 words
The method of claim 1 wherein said coated substrate is treated with an aqueous sodium silicate solution having a concentration of from about 0.1% to about 10.0% by weight, maintained at a temperature of from about 70° to about 210° F for from about 10 seconds to about 5 minutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |