US4533236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charge particle removal device
Assignee: Xerox Corp
•
Filing: 1983-12-01
•
Granted: 1985-08-06
•
Expires: 2003-12-01
Abstract
Abstract Magnetic brush cleaner for removing residual charged particles such as toner from a charge-retentive surface such as a photoreceptor. The brush cleaner has a bias voltage applied thereto for establishing an electrostatic field for aiding in toner removal. A control is provided for varying the bias voltage applied to the brush cleaner in accordance with variations in photoreceptor potential to thereby maintain the cleaning potential (i.e. the difference between the applied bias voltage and the photoreceptor potential) invariant.
Inventors
- 👤 Paul A. Garsin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:32
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/0005; G03G21/0047; G03G2221/00; G03G2221/0005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
66 words
Apparatus for removing charged particles from a charge-retentive surface, said apparatus comprising: a magnetic brush cleaner structure, including magnetically attractable elements; means for applying a bias voltage to said brush cleaner structure; means for moving said brush relative to said charge-retentive surface to thereby remove charged particles therefrom; and means for maintaining constant the difference between said bias voltage and the potential on said charge-retentive surface.
Claim 2
Dependent Claim
66 words
Apparatus for removing charged particles from a charge-retentive surface, said apparatus comprising: a magnetic brush cleaner structure, including magnetically attractable elements; means for applying a bias voltage to said brush cleaner structure; means for moving said brush relative to said charge-retentive surface to thereby remove charged particles therefrom; and means for maintaining constant the difference between said bias voltage and the potential on said charge-retentive surface.
Claim 3
Dependent Claim
18 words
Apparatus according to claim 1 wherein said difference is relatively low whereby the performance cleaning latitude is maximized.
Claim 4
Dependent Claim
12 words
Apparatus according to claim 2 wherein said charge-retentive surface comprises a photoreceptor.
Claim 5
Dependent Claim
13 words
Apparatus according to claim 3 wherein said magnetically attractable elements comprise carrier beads.
Claim 6
Dependent Claim
25 words
Apparatus according to claim 1 wherein said difference maintaining means comprises means for varying said bias voltage in response to a variation in said potential.
Claim 7
Dependent Claim
12 words
Apparatus according to claim 5 wherein said charge-retentive surface comprises a photoreceptor.
Claim 8
Dependent Claim
13 words
Apparatus according to claim 6 wherein said magnetically attractable elements comprise carrier beads.
Claim 9
Dependent Claim
12 words
Apparatus according to claim 1 including means for detoning said brush cleaner.
Claim 10
Dependent Claim
12 words
Apparatus according to claim 2 including means for detoning said brush cleaner.
Claim 11
Dependent Claim
12 words
Apparatus according to claim 5 including means for detoning said brush cleaner.
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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) | 1988-08-05 | 1989-02-04 | 1989-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-05 | 1993-02-04 | 1993-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-05 | 1997-02-04 | 1997-08-06 | $7700.00 | Window Closed / Lapsed |