Patent US4734803A successfully refreshed from Google Patents.
Patent US4524119A successfully refreshed from Google Patents.
US4524119A
Expired / Lapsed
US
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Electrophotographic carriers incorporating fluorinated carbon and process of using same
Assignee: Honeywell International Inc
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Filing: 1983-07-25
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Granted: 1985-06-18
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Expires: 2003-07-25
Abstract
Abstract Novel electrophotographic development carrier particles for use with toner particles comprising a plurality of core particles coated with fluorinated carbon or a fluorinated carbon containing resin and an electrophotographic process comprising forming an electrostatic image on the surface of a photoconductive member and contacting the image with a developer mixture comprising finely divided toner particles mixed with such electrophotographic development carrier particles.
Inventors
- 👤 Matthew H. Luly
- 👤 George D. Lockyer, Jr.
- 👤 Richard E. Eibeck
- 👤 Joseph Gaynor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:19
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/10; G03G9/113; G03G9/1139; G03G9/1132; G03G9/1133; G03G9/1134; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
63 words
Electrophotographic development carrier particles for use with toner particles comprising a plurality of core particles coated with fluorinated carbon or a fluorinated carbon containing resin which resin is capable of binding the fluorinated carbon to the core particles without adversely affecting the desired triboelectric properties of the fluorinated carbon with the proviso that said resin component does not include a fluorine containing resin.
Claim 2
Dependent Claim
63 words
Electrophotographic development carrier particles for use with toner particles comprising a plurality of core particles coated with fluorinated carbon or a fluorinated carbon containing resin which resin is capable of binding the fluorinated carbon to the core particles without adversely affecting the desired triboelectric properties of the fluorinated carbon with the proviso that said resin component does not include a fluorine containing resin.
Claim 3
Dependent Claim
18 words
Electrophotographic development carrier particles in accordance with claim 1 wherein the core particles are coated with fluorinated carbon.
Claim 4
Dependent Claim
22 words
Electrophotographic development carrier particles in accordance with claim 1 in which the fluorinated carbon is derived from carbon black or petroleum coke.
Claim 5
Dependent Claim
19 words
Electrophotographic development carrier particles in accordance with claim 1 in which the fluorinated carbon is derived from crystalline graphite.
Claim 6
Dependent Claim
24 words
Electrophotographic development carrier particles in accordance with claim 1 in which the fluorinated carbon or fluorinated carbon compound is (C 2 F) n .
Claim 7
Dependent Claim
22 words
Electrophotographic development carrier particles in accordance with claim 1 in which the fluorinated carbon or fluorinated carbon component is CF x .
Claim 8
Dependent Claim
32 words
Electrophotographic development carrier particles in accordance with claim 6 in which the fluorinated carbon or fluorinated carbon component has the formula CF x wherein x is from about 0.1 to about 1.2.
Claim 9
Dependent Claim
30 words
Electrophotographic development carrier particles in accordance with claim 1 in which the fluorinated carbon containing component has the formula CF x wherein x is from about 0.1 to about 1.2.
Claim 10
Dependent Claim
22 words
Electrophotographic development carrier particles in accordance with claim 8 in which the fluorinated carbon is derived from carbon black or petroleum coke.
Claim 11
Dependent Claim
35 words
Electrophotographic development carrier particles in accordance with claim 8 wherein the core particles are coated with a fluorinated carbon containing resin selected from the group consisting of styrene/acrylic copolymers, vinyl chloride-acetate copolymers and cellulose-based resins.
Claim 12
Dependent Claim
39 words
An electrophotographic process comprising: (a) forming an electrostatic image on the surface of a photoconductive member, and (b) contacting the image with a developer mixture comprising finely divided toner particles mixed with carrier particles as described in claim 1.
Claim 13
Dependent Claim
17 words
A process as described in claim 11 in which the core particles are coated with fluorinated carbon.
Claim 14
Dependent Claim
18 words
A process as described in claim 1 in which the fluorinated carbon is (C 2 F) n .
Claim 15
Dependent Claim
17 words
A process as described in claim 13 in which the fluorinated carbon is derived from crystalline graphite.
Claim 16
Dependent Claim
26 words
A process as described in claim 1 in which the fluorinated carbon has the formula CF x wherein x is from about 0.1 to about 1.2.
Claim 17
Dependent Claim
20 words
A process as described in claim 15 in which the CF x is derived from carbon black or petroleum coke.
References Cited (Backward Citations)
US4141849A
Cited
US4126458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |