Patent US4663259A successfully refreshed from Google Patents.
US4663259A
Expired / Lapsed
US
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Electrophotographic photosensitive member and image forming process using the same
Assignee: Canon Inc
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Filing: 1985-10-25
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Granted: 1987-05-05
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Expires: 2005-10-25
Abstract
Abstract An electrophotographic photosensitive member comprises a conductive substrate, a charge transport layer and a charge generation layer, wherein said charge generation layer is superposed on said charge transport layer, and said charge generation layer contains particles of a fluorine-containing resin. And, an image forming process comprising the repetition of an electrophotographic process uses said electrophotographic photosensitive member.
Inventors
- 👤 Naoto Fujimura
- 👤 Kiyoshi Sakai
- 👤 Masami Okunuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:26
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0596; G03G21/00; G03G21/0005; G03G21/0011; G03G5/0532; G03G5/0539
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
52 words
An electrophotographic photosensitive member comprising, in sequence, a conductive substrate, a charge transport layer and a charge generation layer, said charge generation layer comprises pigment particles as charge generation material and particles of a fluorine-containing resin, wherein the particle size of said fluorine-containing resin is larger than that of said pigment particles.
Claim 2
Dependent Claim
52 words
An electrophotographic photosensitive member comprising, in sequence, a conductive substrate, a charge transport layer and a charge generation layer, said charge generation layer comprises pigment particles as charge generation material and particles of a fluorine-containing resin, wherein the particle size of said fluorine-containing resin is larger than that of said pigment particles.
Claim 3
Dependent Claim
30 words
An electrophotographic photosensitive member according to claim 1, wherein said charge generation layer contains the particles of said fluorine-containing resin therein in an amount of 0.1 to 40% by weight.
Claim 4
Dependent Claim
30 words
An electrophotographic photosensitive member according to claim 1, wherein said charge generation layer contains the particles of said fluorine-containing resin therein in an amount of 5 to 25% by weight.
Claim 5
Dependent Claim
23 words
An electrophotographic photosensitive member according to claim 1, wherein the particle size of said pigment is in a range from 0.03 to 0.5μ.
Claim 6
Dependent Claim
114 words
An image forming process comprising repeating an electrophotographic process which comprises (a) forming an electrostatic latent image on an electrophotographic photosensitive member comprising, in sequence, a conductive substrate, a charge transport layer and a charge generation layer in which said charge generation layer comprises pigment particles as charge generation material and particles of a fluorine-containing resin, wherein the particle size of said fluorine-containing resin is larger than that of said pigment particles, (b) developing said latent image to form a toner image, (c) transferring the toner image and (d) cleaning any remaining toner with cleaning means having a rubber hardness not less than 65 and maintained at a contact angle of at least 25°.
Claim 7
Dependent Claim
114 words
An image forming process comprising repeating an electrophotographic process which comprises (a) forming an electrostatic latent image on an electrophotographic photosensitive member comprising, in sequence, a conductive substrate, a charge transport layer and a charge generation layer in which said charge generation layer comprises pigment particles as charge generation material and particles of a fluorine-containing resin, wherein the particle size of said fluorine-containing resin is larger than that of said pigment particles, (b) developing said latent image to form a toner image, (c) transferring the toner image and (d) cleaning any remaining toner with cleaning means having a rubber hardness not less than 65 and maintained at a contact angle of at least 25°.
Claim 8
Dependent Claim
28 words
An image forming process according to claim 5, wherein a step for abrading the electrophotographic photosensitive member is conducted between said image transfer step and said cleaning step.
Claim 9
Dependent Claim
24 words
An image forming process according to claim 6, wherein said abrading step is conducted with roller means maintained in contact with said photosensitive member.
Claim 10
Dependent Claim
16 words
An image forming process according to claim 7, wherein said roller means is sponge roller means.
Claim 11
Dependent Claim
29 words
An image forming process according to claim 5, wherein said charge generation layer contains the particles of said fluorine-containing resin in an amount of 0.1 to 40% by weight.
Claim 12
Dependent Claim
29 words
An image forming process according to claim 5, wherein said charge generation layer contains the particles of said fluorine-containing resin in an amount of 5 to 25% by weight.
Claim 13
Dependent Claim
23 words
An image forming process according to claim 5, wherein the particle size of said pigment is in a range from 0.03 to 0.5μ.
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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |