Patent US6128239A successfully refreshed from Google Patents.
Patent US3904409A successfully refreshed from Google Patents.
US3904409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive body for electrophotography and the method of manufacturing the same
Assignee: Canon Inc
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Filing: 1969-03-04
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Granted: 1975-09-09
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Expires: 1989-03-04
Abstract
Abstract A photoconductive body for electrophotography and methods of manufacturing the same. The present invention provides a high sensitivity photoconductive powder of CdS or CdSe by activating powder particles with a surface treatment to provide a potential barrier susceptible to the light, to improve trap level of the surface of the particles and to increase the quantum efficiency of the particles.
Inventors
- 👤 Hiroshi Hanada
- 👤 Toru Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:06
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/142; G03G5/144; G03G5/02; G03G5/04; G03G5/08; H; H10; H10F; H10F77/00; H10F77/10; H10F77/16; H10F77/162; Y; Y10; Y10S; Y10S148/00; Y10S148/064; Y10S148/12; Y10T; Y10T428/00; Y10T428/25; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
27 words
A PHOTOCONDUCTIVE POWDER COMPRISING A PHOTOCONDUCTIVE CORE AND A FIRST PHOTOCONDUCTIVE COATING, SAID CORE EXHIBITING N-TYPE SEMICONDUCTIVITY, SAID FIRST COATING COVERING SAID CORE AND EXHIBITING P-TYPE SEMICONDUCTIVITY.
Claim 2
Dependent Claim
27 words
A PHOTOCONDUCTIVE POWDER COMPRISING A PHOTOCONDUCTIVE CORE AND A FIRST PHOTOCONDUCTIVE COATING, SAID CORE EXHIBITING N-TYPE SEMICONDUCTIVITY, SAID FIRST COATING COVERING SAID CORE AND EXHIBITING P-TYPE SEMICONDUCTIVITY.
Claim 3
Dependent Claim
15 words
A PHOTOSENSITIVE MEMBER COMPRISING THE PHOTOCONDUCTIVE POWDER CLAIMED IN CLAIM 1 AND A BINDER THEREFOR.
Claim 4
Dependent Claim
23 words
THE PHOTOSENSITIVE MEMBER CLAIMED IN CLAIM 2 IN WHICH THE PHOTOSENSITIVE MEMBER IS A PHOTOCONDUCTIVE LAYER AND INCLUDING FURTHER AN OVERLYING INSULATIVE LAYER.
Claim 5
Dependent Claim
78 words
Inorganic photoconductive powder comprising a photoconductive core, a first photoconductive coating covering the core and a second photoconductive coating covering the first coating, the core and the second coating each exhibiting the same type of conductivity selected from the group consisting of n-type semiconductivity and p-type semiconductivity and the first coating exhibiting a type of conductivity different from that of the core and the second coating and selected from the group consisting of n-type semiconductivity and p-type semiconductivity.
Claim 6
Dependent Claim
78 words
Inorganic photoconductive powder comprising a photoconductive core, a first photoconductive coating covering the core and a second photoconductive coating covering the first coating, the core and the second coating each exhibiting the same type of conductivity selected from the group consisting of n-type semiconductivity and p-type semiconductivity and the first coating exhibiting a type of conductivity different from that of the core and the second coating and selected from the group consisting of n-type semiconductivity and p-type semiconductivity.
Claim 7
Dependent Claim
25 words
The photoconductive powder claimed in claim 4, in which the core and the second coating exhibit n-type semiconductivity and the first coating exhibits p-type semiconductivity.
Claim 8
Dependent Claim
25 words
The photoconductive powder claimed in claim 4, in which the core and the second coating exhibit p-type semiconductivity and the first coating exhibits n-type semiconductivity.
Claim 9
Dependent Claim
15 words
A photosensitive member comprising the photoconductive powder claimed in claim 5 and a binder therefor.
Claim 10
Dependent Claim
15 words
A photosensitive member comprising the photoconductive powder claimed in claim 6 and a binder therefor.
Claim 11
Dependent Claim
23 words
The photosensitive member claimed in claim 7 in which the photosensitive member is a photoconductive layer and including further an overlying insulative layer.
Claim 12
Dependent Claim
23 words
The photosensitive member claimed in claim 8 in which the photosensitive member is a photoconductive layer and including further an overlying insulative layer.
Claim 13
Dependent Claim
56 words
Inorganic photoconductive powder comprising a photoconductive core, a first photoconductive coating covering the core and a second photoconductive coating covering the first coating, the first coating exhibiting positively introduced i-type semi-insulation and the core and the second coating each exhibiting a different type of conductivity selected from the group consisting of n-type semiconductivity and p-type semiconductivity.
Claim 14
Dependent Claim
56 words
Inorganic photoconductive powder comprising a photoconductive core, a first photoconductive coating covering the core and a second photoconductive coating covering the first coating, the first coating exhibiting positively introduced i-type semi-insulation and the core and the second coating each exhibiting a different type of conductivity selected from the group consisting of n-type semiconductivity and p-type semiconductivity.
Claim 15
Dependent Claim
21 words
The photoconductive powder claimed in claim 11, in which the core exhibits n-type semiconductivity and the second coating exhibits p-type semiconductivity.
Claim 16
Dependent Claim
21 words
The photoconductive powder claimed in claim 11, in which the core exhibits p-type semiconductivity and the second coating exhibits n-type semiconductivity.
Claim 17
Dependent Claim
31 words
The photoconductive powder claimed in claim 12, in which the core comprises CdS and the second coating comprises a material selected from the group consisting of Cu2S, Ag2S, Cu2O and Ag2O.
Claim 18
Dependent Claim
31 words
The photoconductive powder claimed in claim 12, in which the core comprises CdSe, and the second coating comprises a material selected from the group consisting of Cu2Se, Ag2Se, Cu2O and Ag2O.
Claim 19
Dependent Claim
37 words
The photoconductive powder claimed in claim 12, in which the core comprises CdS, the first coating comprises CdS and the second coating comprises Cu2S, the second coating being formed on the first coating by chemical substitution reaction.
Claim 20
Dependent Claim
37 words
The photoconductive powder claimed in claim 12, in which the core comprises CdSe, the first coating comprises CdSe and the second coating comprises Cu2Se, the second coating being formed on the first coating by chemical substitution reaction.
Claim 21
Dependent Claim
33 words
The photoconductive powder claimed in claim 12, in which the core comprises CdS and the first coating comprises n-type CdS which is rendered i-type semi-insulative by the addition of Cu acceptor impurity thereto.
Claim 22
Dependent Claim
33 words
The photoconductive powder claimed in claim 12, in which the core comprises CdS and the first coating comprises n-type CdS which is rendered i-type semi-insulative by the addition of Ag acceptor impurity thereto.
Claim 23
Dependent Claim
33 words
The photoconductive powder claimed in claim 12, in which the core comprises CdSe and the first coating comprises n-type CdSe which is rendered itype semi-insulative by the addition of Cu acceptor impurity thereto.
Claim 24
Dependent Claim
33 words
The photoconductive powder claimed in claim 12, in which the core comprises CdSe and the first coating comprises n-type CdSe which is rendered i-type semi-insulative by the addition of Ag acceptor impurity thereto.
Claim 25
Dependent Claim
22 words
The photoconductive powder claimed in claim 12, in which the second coating comprises Cu2O formed on the first coating by Fehling reaction.
Claim 26
Dependent Claim
32 words
The photoconductive powder claimed in claim 12, in which the second coating comprises Ag2O formed on the first coating by the chemical reaction of a soluble silver salt and an alkaline material.
Claim 27
Dependent Claim
15 words
A photosensitive member comprising the photoconductive powder claimed in claim 11 and a binder therefor.
Claim 28
Dependent Claim
23 words
The photosensitive member claimed in claim 24 in which the photosensitive member is a photoconductive layer and including further an overlying insulative layer.
References Cited (Backward Citations)
US2876202A
Cited
US2844640A
Cited
US2908588A
Cited
US3041166A
Cited
US3060134A
Cited
US3251714A
Cited
US3162526A
Cited
US3351516A
Cited
US3307983A
Cited
US3379527A
Cited
US3374108A
Cited
US3312547A
Cited
US3568306A
Cited
US3541028A
Cited
US3449148A
Cited
US3560398A
Cited
US3519480A
Cited
US3595646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |