Patent US2957765A successfully refreshed from Google Patents.
US2957765A
Expired / Lapsed
US
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Method of and composition for preparing lithographic printing plates
Assignee: GAF Chemicals Corp
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Filing: 1957-06-13
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Granted: 1960-10-25
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Expires: 1977-06-13
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Resetich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:03
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
THE METHOD OF TREATING THE NON-IMAGE AREAS OF THE SURFACE OF A MASTER PLATE PRODUCED BY THE ELECTROSTATIC PROCESS TO RENDER IT SUITABLE FOR USE IN LITHOGRAPHIC PRINTING WHICH AREAS ARE COMPOSED OF A PHOTOCONDUCTIVE INSULATED LAYER COMPRISING A DISPERSION OF ZINC OXIDE IN A HYDROPHOBIC SILICONE RESIN BINDER, THE IMAGE AREAS OF WHICH PLATE ARE FORMED OF A HYDROPHOBIC ELECTROSTATICALLY ATTRACTABLE RESINOUS POWDER, IN ORDER TO RENDER SAID NONIMAGE AREAS HYDROPHILIC WITHOUT AFFECTING THE HYDROPHOBIC PROPERTIES OF SAID IMAGE AREAS, WHICH COMPRISES CONTACTING SAID NON-IMAGE AREAS, WITH A CONVERSION SOLUTION CONSISTING ESSENTIALLY OF 1 TO 20 PARTS BY WEIGHT OF A LOWER ALIPHATIC MONOHYDRIC ALCOHOL, 5 TO 20 PARTS BY WEIGHT OF A MONOBASIC ACID PHOSPHATE SELECTED FROM THE CLASS CONSISTING OF AN AMMONIUM ACID PHOSPHATE AND AN ALKALI METAL ACID PHOSPHATE AND THE REMAINDER WATER.
Claim 2
Independent Claim
137 words
THE METHOD OF TREATING THE NON-IMAGE AREAS OF THE SURFACE OF A MASTER PLATE PRODUCED BY THE ELECTROSTATIC PROCESS TO RENDER IT SUITABLE FOR USE IN LITHOGRAPHIC PRINTING WHICH AREAS ARE COMPOSED OF A PHOTOCONDUCTIVE INSULATED LAYER COMPRISING A DISPERSION OF ZINC OXIDE IN A HYDROPHOBIC SILICONE RESIN BINDER, THE IMAGE AREAS OF WHICH PLATE ARE FORMED OF A HYDROPHOBIC ELECTROSTATICALLY ATTRACTABLE RESINOUS POWDER, IN ORDER TO RENDER SAID NONIMAGE AREAS HYDROPHILIC WITHOUT AFFECTING THE HYDROPHOBIC PROPERTIES OF SAID IMAGE AREAS, WHICH COMPRISES CONTACTING SAID NON-IMAGE AREAS, WITH A CONVERSION SOLUTION CONSISTING ESSENTIALLY OF 1 TO 20 PARTS BY WEIGHT OF A LOWER ALIPHATIC MONOHYDRIC ALCOHOL, 5 TO 20 PARTS BY WEIGHT OF A MONOBASIC ACID PHOSPHATE SELECTED FROM THE CLASS CONSISTING OF AN AMMONIUM ACID PHOSPHATE AND AN ALKALI METAL ACID PHOSPHATE AND THE REMAINDER WATER.
References Cited (Backward Citations)
US1977646A
Cited
US2003268A
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US2134165A
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US2297691A
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US2357809A
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US2766118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |