US3867145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methanol and heat treated zinc oxide
Assignee: Xerox Ltd
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Filing: 1970-03-19
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Granted: 1975-02-18
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Expires: 1990-03-19
Abstract
Abstract Photoconductive zinc oxide powder is wetted with a liquid selected from the group consisting of water, methanol and mixtures thereof and thereafter heat treated at a temperature between about 400* and about 700*C. The treated zinc oxide powder may be mixed with a resinous binder and thereafter formed into an electrophotographic layer.
Inventors
- 👤 Satoru Honjo
- 👤 Hajime Miyazuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:32
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08; C; C01; C01G; C01G9/00; C01G9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A PROCESS FOR TREATING PHOTOCONDUCTIVE ZINC OXIDE POWDER COMPRISING THE STEPS OF WETTING ZINC OXIDE POWDER WITH METHANOL AND THEREAFTER HEAT TREATING SAID ZINC OXIDE AT A TEMPERATURE BETWEEN ABOUT 400*C AND ABOUT 700*C IN AN OXIDATIVE ATMOSPHERE.
Claim 2
Dependent Claim
38 words
A PROCESS FOR TREATING PHOTOCONDUCTIVE ZINC OXIDE POWDER COMPRISING THE STEPS OF WETTING ZINC OXIDE POWDER WITH METHANOL AND THEREAFTER HEAT TREATING SAID ZINC OXIDE AT A TEMPERATURE BETWEEN ABOUT 400*C AND ABOUT 700*C IN AN OXIDATIVE ATMOSPHERE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |