US4043298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic toner scavenging system
Assignee: Xerox Corp
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Filing: 1976-05-26
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Granted: 1977-08-23
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Expires: 1996-05-26
Abstract
Abstract In a magnetic scavenging system for recovering airborne magnetic toner from a magnetizable recording member, alternating polarity magnetic field producing means are provided in the path of flow of toner between a magnetic scavenger and a toner reservoir.
Inventors
- 👤 Stanley B. Swackhamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:36
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G19/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
A magnetic toner recovery apparatus, comprising: a. a non-alternating polarity magnetic field producing magnet within a first rotatable member, said magnet and rotatable member positioned relative to a magnetizable recording medium travel path so that the magnetic field of said magnet is of sufficient strength to magnetically attract airborne toner from the vicinity of a recording medium to said rotatable member but insufficient to prevent gravity fall of toner from said member after predetermined movement of toner by said rotatable member; and b. an electromagnet within a second rotatable member, said second rotatable member being positioned below said first rotatable member and in the path of gravity fall of toner from said first rotatable member; said electromagnetic provided with windings in a direction which produces a magnetic field substantially parallel to the direction of gravity fall of toner; the magnetic field alternating in magnetic polarity.
Claim 2
Dependent Claim
145 words
A magnetic toner recovery apparatus, comprising: a. a non-alternating polarity magnetic field producing magnet within a first rotatable member, said magnet and rotatable member positioned relative to a magnetizable recording medium travel path so that the magnetic field of said magnet is of sufficient strength to magnetically attract airborne toner from the vicinity of a recording medium to said rotatable member but insufficient to prevent gravity fall of toner from said member after predetermined movement of toner by said rotatable member; and b. an electromagnet within a second rotatable member, said second rotatable member being positioned below said first rotatable member and in the path of gravity fall of toner from said first rotatable member; said electromagnetic provided with windings in a direction which produces a magnetic field substantially parallel to the direction of gravity fall of toner; the magnetic field alternating in magnetic polarity.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 wherein said electromagnet is provided with means for periodically interrupting direct current flowing through the windings of said electromagnet.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 wherein said electromagnet is energized with alternating current.
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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |