US4761709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact brush charging
Assignee: Xerox Corp
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Filing: 1986-11-10
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Granted: 1988-08-02
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Expires: 2006-11-10
Abstract
Abstract A contact brush charging device together with a method for charging an insulating layer are provided wherein the charging brush comprises a plurality of resiliently, flexible thin fibers having an electrical resistivity of from about 102 ohms-cm to about 106 ohms-cm and being substantially resistivity stable to changes in relative humidity and temperature. In a preferred embodiment the plurality of fibers are arranged in a uniform distribution of fibers along the length of the brush and comprise partially carbonized polyacrylonitrile fibers having an electrical resistivity from about 103 ohms-cm to about 105 ohms-cm and being substantially homogeneous in composition.
Inventors
- 👤 Joan R. Ewing
- 👤 Joseph A. Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:13
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/0233; G03G21/00; G03G21/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
76 words
A contact brush charging device for charging an insulating layer comprising a plurality of resiliently flexible thin partially carbonized polyacrylonitrile fibers arranged in a brush like configuration, said fibers being supported by a support means so that the distal ends of the fibers may contact the insulating layer and having an electrical resistivity of from about 10 2 ohms-cm to about 10 6 ohms-cm and being substantially resistivity stable to changes in relative humidity and temperature.
Claim 2
Dependent Claim
76 words
A contact brush charging device for charging an insulating layer comprising a plurality of resiliently flexible thin partially carbonized polyacrylonitrile fibers arranged in a brush like configuration, said fibers being supported by a support means so that the distal ends of the fibers may contact the insulating layer and having an electrical resistivity of from about 10 2 ohms-cm to about 10 6 ohms-cm and being substantially resistivity stable to changes in relative humidity and temperature.
Claim 3
Dependent Claim
23 words
The device in claim 1, wherein said fibers have an electrical resistivity of from about 10 3 ohms-cm to about 10 5 ohms-cm.
Claim 4
Dependent Claim
22 words
The device of claim 1, wherein said plurality of fibers are arranged in a uniform distribution along the length of the brush.
Claim 5
Dependent Claim
13 words
The device of claim 1, wherein said fibers are substantially homogenous in composition.
Claim 6
Dependent Claim
25 words
The device of claim 1, wherein said fibers are generally circular in cross section and from about 5 microns to about 50 microns in diameter.
Claim 7
Dependent Claim
19 words
The device of claim 5, wherein said fibers are from about 8 microns to about 10 microns in diameter.
Claim 8
Dependent Claim
31 words
The device of claim 1, wherein said fibers are arranged in said brush to have a fiber fill density of from about 5×10 4 to 4×10 6 fibers per square inch.
Claim 9
Dependent Claim
20 words
The device of claim 1, wherein said fibers are arranged in a rotary brush configuration around a cylindrical conductive sleeve.
Claim 10
Independent Claim
90 words
The method of charging an insulating layer comprising contacting the surface with a charging brush having applied thereto an electrical potential, said charging brush comprising a plurality of resiliently flexible thin partially carbonized polyacrylonitrile fibers arranged in a brush like configuration, said fibers being supported by a support means so that the distal ends of the fibers may contact the insulating layer and having an electrical resistivity of from about 10 2 ohms-cm to about 10 6 ohms-cm and being substantially resistivity stable to changes in relative humidity and temperature.
Claim 11
Independent Claim
90 words
The method of charging an insulating layer comprising contacting the surface with a charging brush having applied thereto an electrical potential, said charging brush comprising a plurality of resiliently flexible thin partially carbonized polyacrylonitrile fibers arranged in a brush like configuration, said fibers being supported by a support means so that the distal ends of the fibers may contact the insulating layer and having an electrical resistivity of from about 10 2 ohms-cm to about 10 6 ohms-cm and being substantially resistivity stable to changes in relative humidity and temperature.
Claim 12
Dependent Claim
23 words
The method of claim 9, wherein said fibers have an electrical resistivity of from about 10 3 ohms-cm to about 10 5 ohms-cm.
Claim 13
Dependent Claim
22 words
The method of claim 10, wherein said plurality of fibers are arranged in a uniform distribution along the length of the brush.
Claim 14
Dependent Claim
13 words
The method of claim 11, wherein said fibers are substantially homogenous in composition.
Claim 15
Dependent Claim
25 words
The method of claim 9, wherein said fibers are generally circular in cross section and from about 5 microns to about 50 microns in diameter.
Claim 16
Dependent Claim
19 words
The method of claim 13, wherein said fibers are from about 8 microns to about 10 microns in diameter.
Claim 17
Dependent Claim
31 words
The method of claim 14, wherein said fibers are arranged in said brush to have a fiber fill density of from about 5×10 4 to 4×10 6 fibers per square inch.
Claim 18
Dependent Claim
17 words
The method of claim 9, wherein said fibers are arranged in the form of a rotary brush.
Claim 19
Dependent Claim
96 words
A contact brush charging device for charging an insulating layer comprising a plurality of resiliently flexible thin partially carbonized polyacrylonitrile fibers arranged in a brush like configuration, support means for supporting said fibers so that the distal ends of the fibers may contact the insulating layer, said fibers being homogenous in composition having an electrical resistivity of from about 10 2 ohms-cm to about 10 6 ohms-cm, substantially resistivity stable to changes in relative humidity and temperature, and self limiting in terms of current flow to thereby avoid electrically short circuiting imperfections in said insulating layer.
Claim 20
Dependent Claim
96 words
A contact brush charging device for charging an insulating layer comprising a plurality of resiliently flexible thin partially carbonized polyacrylonitrile fibers arranged in a brush like configuration, support means for supporting said fibers so that the distal ends of the fibers may contact the insulating layer, said fibers being homogenous in composition having an electrical resistivity of from about 10 2 ohms-cm to about 10 6 ohms-cm, substantially resistivity stable to changes in relative humidity and temperature, and self limiting in terms of current flow to thereby avoid electrically short circuiting imperfections in said insulating layer.
Claim 21
Dependent Claim
31 words
The device of claim 17, wherein said fibers are arranged in said brush to have a fiber fill density of from about 5×10 4 to 4×10 6 fibers per square inch.
Claim 22
Independent Claim
110 words
The method of charging an insulating layer, comprising contacting the surface with a charging brush having applied thereto an electrical potential, said charging brush comprising a plurality of resiliently flexible thin partially carbonized polyacrylonitrile fibers arranged in a brush like configuration, support means for supporting said fibers so that the distal ends of the fibers may contact the insulating layer, said fibers being homogenous in composition having an electrical resistivity of from about 10 2 ohms-cm to about 10 6 ohms-cm, substantially resistivity stable to changes in relative humidity and temperature, and self limiting in terms of current flow to thereby avoid electrically short circuiting imperfections in said insulating layer.
Claim 23
Independent Claim
110 words
The method of charging an insulating layer, comprising contacting the surface with a charging brush having applied thereto an electrical potential, said charging brush comprising a plurality of resiliently flexible thin partially carbonized polyacrylonitrile fibers arranged in a brush like configuration, support means for supporting said fibers so that the distal ends of the fibers may contact the insulating layer, said fibers being homogenous in composition having an electrical resistivity of from about 10 2 ohms-cm to about 10 6 ohms-cm, substantially resistivity stable to changes in relative humidity and temperature, and self limiting in terms of current flow to thereby avoid electrically short circuiting imperfections in said insulating layer.
Claim 24
Dependent Claim
31 words
The method of claim 19, wherein said fibers are arranged in said brush to have a fiber fill density of from about 5×10 4 to 4×10 6 fibers per square inch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |