US3837853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic method of imaging with an element containing an amorphous semiconductor
Assignee: Canon Inc
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Filing: 1972-10-31
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Granted: 1974-09-24
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Expires: 1992-10-31
Abstract
Abstract An electrophotographic photosensitive member which comprises mainly a base layer, an amorphous semiconductor capable of reversible transition between a highly resistive and conductive state, and a photoconductive layer. An electrophotographic process utilizing said photosensitive member produces images of high contrast and high resolving property.
Inventors
- 👤 T Masaki
- 👤 H Hanada
- 👤 N Kitashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:49
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/147; G03G15/00; G03G15/22; G03G15/226; G03G5/02; G03G5/04; G03G5/043; G03G5/0433; G03G5/0436; G03G5/14704
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
34 words
A method according to claim 1 in which the layers of the photosensitive member are laminated in the sequence of recitation as follows: the conductive layer, the photoconductive layer, and the amorphous semiconductor layer.
Claim 2
Independent Claim
68 words
A method for forming an electrostatic image comprising providing a photosensitive member having a conductive layer, an amorphous semiconductor layer capable of reversible transition between an insulating state and a conductive state, a photoconductive layer and an insulating layer, charging uniformly the photosensitive member, and projecting a light image onto said photosensitive member while contemporaneously applying thereto a voltage exceeding a threshold value of said amorphous semiconductor layer.
Claim 3
Dependent Claim
26 words
A method according to claim 3 in which the voltage exceeding a threshold value is DC corona voltage having a polarity opposite to the primary charging.
Claim 4
Dependent Claim
18 words
A method according to claim 3 in which the voltage exceeding a threshold value is AC corona voltage.
Claim 5
Dependent Claim
49 words
A method according to claim 3 in which the layers of the photosensitive member are laminated in the sequence of recitation as follows: the conductive layer, the photoconductive layer, the amorphous semiconductive layer capable of reversible transition between an insulating state and a conductive state and the insulating layer.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |