US3579332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-crystal zinc oxide and an electrophotographic plate made therefrom
Assignee: RCA Corp
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Filing: 1968-05-27
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Granted: 1971-05-18
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Expires: 1988-05-27
Abstract
Abstract AN IMPROVED ELECTROPHOTOGRAPHIC PLATE HAS A PHOTOCONDUCTIVE LAYER OF ONE OR MORE RELATIVELY LARGE WAFERS OF SINGLE-CRYSTAL, N-TYPE ZINC OXIDE. EACH WAFER IS FIXED TO, AND IN ELECTRICAL CONTACT WITH, AN ELECTRICALLY CONDUCTIVE BACKING. THE NOVEL METHOD OF CHARGING THE ELECTROPHOTOGRAPHIC PLATE COMPRISES (1) WETTING A MAJOR SURFACE OF THE ZINC OXIDE LAYER WITH A SOLUTION OF AN IONIZABLE SALT IN A RELATIVELY VOLATILE SOLVENT WHILE BIASING THE SOLUTION WITH A NEGATIVE VOLTAGE WITH RESPECT TO THE BACKING, AND (2) ALLOWING THE SOLVENT TO EVAPORATE, WHEREBY TO LEAVE AN ELECTROSTATIC CHARGE ON THE ZINC OXIDE SURFACE.
Inventors
- 👤 Richard Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:01
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; G03G5/087; G03G5/082
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |