Patent US4112156A successfully refreshed from Google Patents.
US4112156A
Expired / Lapsed
US
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Magnetic toner recovery method using alternating magnetic field polarities
Assignee: Xerox Corp
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Filing: 1977-02-14
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Granted: 1978-09-05
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Expires: 1997-02-14
Abstract
Abstract Airborne magnetic toner is recovered from the vicinity of a magnetizable recording medium by magnetically attracting the toner with a magnetic field which does not alternate in magnetic polarity thereby magnetically polarizing the toner; and, subsequently passing the polarized magnetic toner through a magnetic field which alternates in magnetic polarity thereby decreasing the magnetic polarization of the magnetic toner. This procedure maintains the flow characteristics of the toner and avoids the clumping together of toner normally associated with magnetic recovery of magnetic toner.
Inventors
- 👤 Stanley B. Swackhamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:49
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G19/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
61 words
A method for recovering airborne toner from the vicinity of a magnetizable recording medium, comprising: magnetically attracting airborne magnetic toner with a magnetic field which does not alternate in magnetic polarity thereby magnetically polarizing said magnetic toner; and passing said polarized magnetic toner through a magnetic field which alternates in magnetic polarity thereby decreasing the magnetic polarization of said magnetic toner.
Claim 2
Independent Claim
61 words
A method for recovering airborne toner from the vicinity of a magnetizable recording medium, comprising: magnetically attracting airborne magnetic toner with a magnetic field which does not alternate in magnetic polarity thereby magnetically polarizing said magnetic toner; and passing said polarized magnetic toner through a magnetic field which alternates in magnetic polarity thereby decreasing the magnetic polarization of said magnetic toner.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the frequency of alternation in magnetic polarity is at least about 60 Hz.
References Cited (Backward Citations)
US3333572A
Cited
US3894513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |