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Patent US3672885A successfully refreshed from Google Patents.
US3672885A
Expired / Lapsed
US
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Ferrocyanide-chelate conversion solution for electrophotographic offset masters
Assignee: AB Dick Co
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Filing: 1970-10-23
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Granted: 1972-06-27
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Expires: 1990-10-23
Abstract
Abstract A CONVERSION SOLUTION FOR ZINC OXIDE COATED ELECTROPHOTOGRAPHIC PLANOGRAPHIC MASTERS IN WHICH THE CONVERSION SOLUTION DEPENDS UPON THE PRESENCE OF FERROCYANIDE IN SOLUTION THEREIN, IN WHICH THE IMPROVEMENT COMPRISES THE FORMUALTION OF THE CONVESION SOLUTION WITH A CHELATING AGENT THAT SEQUESTERS THE FE++ AND FE++ IONS PRESENT IN THE SOLUTION BY REASON OF THE EQUILIBRIUM REACTION OF THE FERROCYANIDE WHEEBY THE SOLUTION IS STABLILIZED TO MINIMIZE DETERIORATION AND INCREASE THE STABILITY AND SHELF LIFE THEREOF.
Inventors
- 👤 George M Ort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:27
CPC Classifications
B; B41; B41N; B41N3/00; B41N3/08
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |