US2957765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and composition for preparing lithographic printing plates
Assignee: GAF Chemicals Corp
•
Filing: 1957-06-13
•
Granted: 1960-10-25
•
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 20:12
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
Cited
US2134165A
Cited
US2297691A
Cited
US2357809A
Cited
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 |