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Patent US4727009A successfully refreshed from Google Patents.
US4727009A
Expired / Lapsed
US
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Electrophotographic photosensitive member having two charge transport layers differing in oxidation potentials
Assignee: Canon Inc
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Filing: 1987-02-20
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Granted: 1988-02-23
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Expires: 2007-02-20
Abstract
Abstract An electrophotographic photosensitive member comprises a conductive support, and at least a charge generation layer, a first charge transport layer containing a charge transporting material, and a second charge transport layer containing a charge transporting material having higher oxidation potential than that of the charge transporting material contained in said first charge transport layer, which layers are successively laminated on said conductive support.
Inventors
- 👤 Hideyuki Takai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:26
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/047
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
An electrophotographic photosensitive member comprising a conductive support, and at least a charge generation layer, a first charge transport layer containing a charge transporting material, and a second charge transport layer containing a charge transporting material having higher oxidation potential than that of the charge transporting material contained in said first charge transport layer, which layers are successively laminated on said conductive support.
Claim 2
Dependent Claim
63 words
An electrophotographic photosensitive member comprising a conductive support, and at least a charge generation layer, a first charge transport layer containing a charge transporting material, and a second charge transport layer containing a charge transporting material having higher oxidation potential than that of the charge transporting material contained in said first charge transport layer, which layers are successively laminated on said conductive support.
Claim 3
Dependent Claim
23 words
The electrophotographic photosensitive member according to claim 1, wherein the oxidation potential difference between said charge transporting materials is 0.1 to 0.5 (V).
Claim 4
Dependent Claim
23 words
The electrophotographic photosensitive member according to claim 1, wherein said first charge transport layer has a film thickness of 3 to 30 μm.
Claim 5
Dependent Claim
23 words
The electrophotographic photosensitive member according to claim 3, wherein said first charge transport layer has a film thickness of 6 to 20 μm.
Claim 6
Dependent Claim
23 words
The electrophotographic photosensitive member according to claim 1, wherein said second charge transport layer has a film thickness of 0.5 to 15 μm.
Claim 7
Dependent Claim
23 words
The electrophotographic photosensitive member according to claim 5, wherein said second charge transport layer has a film thickness of 1 to 12 μm.
Claim 8
Dependent Claim
33 words
The electrophotographic photosensitive member according to claim 1, wherein said second charge transport layer has a film thickness accounting for 80% or less of the total film thickness of the charge transport layers.
Claim 9
Dependent Claim
39 words
The electrophotographic photosensitive member according to claim 7, wherein said second charge transport layer has a film thickness accounting for not less than 5% and not more than 70% of the total film thickness of the charge transport layers.
References Cited (Backward Citations)
US3997342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |