Patent US3758330A successfully refreshed from Google Patents.
US3758330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making a printing master
Assignee: AB Dick Co
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Filing: 1971-10-26
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Granted: 1973-09-11
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Expires: 1991-10-26
Abstract
Abstract A PROCESS FOR MAKING A PRINTING MASTER WHEREIN A PHOTOCONDUCTIVE LAYER IS SELECTIVELY CHARGED TO A DESIRED AREA CONFIGURATION. THE CHARGED LAYER IS THEN IMMERSED IN AN EMULSION OF A CONDUCTING CONVERSION SOLUTION IN A NONCONVERTING NON-CONDUCTING LIQUID. IF THE SOLUTION IS OPPOSITELY CHARGED FROM THE AREA CONFIGURATION IT IS ATTRACTED TO THE CHARGED AREAS AND CONVERTS THEM WHILE THE NONCHARGED AREAS REMAIN UNCONVERTED. IF THE SOLUTION IS OF THE SAME CHARGE AS THE CHARGED AREAS, IT WILL BE REPELLED BY THEM AND THEY WILL REMAIN UNCONVERTED AND THE NONCHARGED AREAS, AFTER A PERIOD OF TIME, WILL BE CONVERTED.
Inventors
- 👤 E Richman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:44
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/26; G03G13/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |