US3647430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
METHOD OF THE PREPARATION OF CdS OR CdSe POWDER FOR ELECTROPHOTOGRAPHY AND METHOD OF MAKING AN ELECTROPHOTOGRAPHIC PHOTOSENSITIVE PLATE BY USING THE POWDER
Assignee: Canon Inc
•
Filing: 1968-06-05
•
Granted: 1972-03-07
•
Expires: 1988-06-05
Abstract
Abstract CdS or CdSe powders are treated by adding silver or copper as an activator, firing the mixture in the presence of CdCl2 or ZnO together with HC1, and after washing and drying the resultant powder, firing the dried powder in an atmosphere of S vapor. The powder thus produced is mixing with a bonding resin to form a photosensitive layer and an electrophotographic photoconductive plate is made therefrom.
Inventors
- 👤 Hiroshi Hanada
- 👤 Nobuo Kitajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:28
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
51 words
A method according to claim 1 wherein the first firing is carried out at a temperature of 600* C. for 20-30 minutes and the second firing is carried out at a temperature of 500* C. for 10 minutes in an atmosphere of sulfur vapor and thereafter under vacuum for 10 minutes.
Claim 2
Dependent Claim
14 words
A method according to claim 1 wherein the bonding resin comprises an epoxy resin.
Claim 3
Dependent Claim
13 words
A method according to claim 3 wherein the insulating film comprises polyethylene terephthalate.
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) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |