Patent US274459A successfully refreshed from Google Patents.
US4847653A
Expired / Lapsed
US
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Triboelectrically charging member
Assignee: Minolta Co Ltd
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Filing: 1988-03-04
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Granted: 1989-07-11
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Expires: 2008-03-04
Abstract
Abstract The disclosure relates to a triboelectrically charging member including a surface formed with an amorphous carbon film containing at least carbon, hydrogen and fluorine atoms. The amorphous carbon film is formed by plasma polymerization with a glow discharge method. The triboelectrically charging member of the present invention has high hardness, is excellent in friction resistance and can retain a good copy image quality over time.
Inventors
- 👤 Isao Doi
- 👤 Hideo Hotomi
- 👤 Toshiya Natsuhasra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0806; G03G15/0812
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
21 words
A triboelectrically charging member including a surface formed with an amorphous carbon film containing at least carbon, hydrogen and fluorine atoms.
Claim 2
Dependent Claim
21 words
A triboelectrically charging member including a surface formed with an amorphous carbon film containing at least carbon, hydrogen and fluorine atoms.
Claim 3
Dependent Claim
24 words
A triboelectrically charging member as claimed in claim 1 wherein the amorphous carbon film is formed by plasma polymerization with a glow discharge method.
Claim 4
Dependent Claim
37 words
A triboelectrically charging member as claimed in claim 1 wherein the amorphous carbon film contains fluorine atoms in an amount of about 1 to about 70 atomic % based on all the constituent atoms in the film.
Claim 5
Dependent Claim
37 words
A triboelectrically charging member as claimed in claim 1 wherein the amorphous carbon film contains hydrogen atoms in an amount of about 0.1 to about 67 atomic % based on all the constituent atoms in the film.
Claim 6
Dependent Claim
37 words
A triboelectrically charging member as claimed in claim 4 wherein the hydrogen content in the amorphous carbon film is preferably from about 30 to about 60 atomic % based on all the constituent atoms in the film.
Claim 7
Dependent Claim
24 words
A triboelectrically charging member as claimed in claim 1 wherein the amorphous carbon film has a thickness of about 1 to about 200 microns.
Claim 8
Dependent Claim
61 words
A triboelectrically charging member as claimed in claim 1 is used in a developing device of an electrophotographic copying machine which employs monocomponent developer, said developing device including a developing roller and said member being provided to be in contact with the developing roller for triboelectrically charging the developer to form a thin layer of the developer on the developing roller.
Claim 9
Dependent Claim
35 words
A member including a surface formed with an amorphous carbon film containing at least carbon, hydrogen and fluorine atoms, said member being used in developing device of an electrophotographic copying machine for triboelectrically charging developer.
Claim 10
Dependent Claim
35 words
A member including a surface formed with an amorphous carbon film containing at least carbon, hydrogen and fluorine atoms, said member being used in developing device of an electrophotographic copying machine for triboelectrically charging developer.
References Cited (Backward Citations)
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Cited
JPS58132769A
Cited
US4575220A
Cited
US4528937A
Cited
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Cited
JPS61176961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |