Patent US4057666A successfully refreshed from Google Patents.
US4057666A
Expired / Lapsed
US
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Magnetic brush developer roll for electrostatic reproduction machines
Assignee: Xerox Corp
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Filing: 1973-10-29
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Granted: 1977-11-08
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Expires: 1993-10-29
Abstract
Abstract A magnetic brush roller for electrostatic copier or reproduction machines of the type wherein a latent electrostatic image formed on the surface of the machine photoconductor is developed by means of a single or multiple roller magnetic brush apparatus. The outer sleeve of the magnetic brush roller is formed from a non-metallic material, i.e. plastic impregnated with small chip-like pieces of relatively hard material designed to provide the necessary surface roughness.
Inventors
- 👤 Arthur Drummond, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:19
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921; G03G15/0928; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1352; Y10T428/1355; Y10T428/1372; Y10T428/1386; Y10T428/24; Y10T428/24942; Y10T428/24983
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
A sleeve like part for use as a magnetic brush developer comprising a first base material impregnated with particles of a second material, to form a rigid part, said second material being harder than said first base material whereby the wear resistance of said second material is greater than the wear resistance of said first base material, and a third electrically conductive filler material to promote electrical conductivity of said part.
Claim 2
Dependent Claim
71 words
A sleeve like part for use as a magnetic brush developer comprising a first base material impregnated with particles of a second material, to form a rigid part, said second material being harder than said first base material whereby the wear resistance of said second material is greater than the wear resistance of said first base material, and a third electrically conductive filler material to promote electrical conductivity of said part.
Claim 3
Dependent Claim
27 words
The magnetic brush sleeve according to claim 1, including a filler material to promote electrical conductivity chosen from the group consisting of carbon, graphite and nonferrous metals.
References Cited (Backward Citations)
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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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |