Patent US4284031A successfully refreshed from Google Patents.
US4284031A
Expired / Lapsed
US
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Magnetic transfer surface for controlling toner thickness
Assignee: Unisys Corp
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Filing: 1978-08-04
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Granted: 1981-08-18
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Expires: 1998-08-04
Abstract
Abstract In an electrophoretic printer for printing an image on a recipient sheet, magnetic tape means having a predetermined magnetization reversal is utilized to control the thickness of the toner layer thereon.
Inventors
- 👤 James B. Thaxter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:45
CPC Classifications
G; G03; G03G; G03G17/00; G03G2217/00; G03G2217/0083; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
115 words
An electrophoretic printer for printing an image upon a recipient sheet comprising: a reservoir of magnetically susceptible toner; magnetic brush means, having an outer surface and an inner surface of repetitive and equally spaced north and south magnetic poles, associated with said reservoir for attracting the magnetically susceptible toner; magnetic transport surface means having an aperiodic magnetic reversal pattern thereon, said magnetic reversal pattern having a pitch selected to provide a desired thickness of magnetically susceptible toner received by the magnetic surface transport means, aligned and cooperating with said magnetic brush means; and a print head situated above said magnetic transport surface to receive simultaneously the recipient sheet and the layer of magnetically susceptible toner.
Claim 2
Dependent Claim
115 words
An electrophoretic printer for printing an image upon a recipient sheet comprising: a reservoir of magnetically susceptible toner; magnetic brush means, having an outer surface and an inner surface of repetitive and equally spaced north and south magnetic poles, associated with said reservoir for attracting the magnetically susceptible toner; magnetic transport surface means having an aperiodic magnetic reversal pattern thereon, said magnetic reversal pattern having a pitch selected to provide a desired thickness of magnetically susceptible toner received by the magnetic surface transport means, aligned and cooperating with said magnetic brush means; and a print head situated above said magnetic transport surface to receive simultaneously the recipient sheet and the layer of magnetically susceptible toner.
Claim 3
Dependent Claim
29 words
An electrophoretic printer according to claim 1 wherein the magnetization of the transport surface is oriented in the plane of the surface and parallel to the longitudinal extent thereof.
Claim 4
Dependent Claim
23 words
An electrophoretic printer according to claim 1 wherein the magnetization of the transport surface is oriented perpendicular to the plane of the surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |