US3945343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic brush for use in magnetic printing
Assignee: Genicom Corp
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Filing: 1975-03-24
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Granted: 1976-03-23
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Expires: 1995-03-24
Abstract
Abstract An improved magnetic brush for transferring toner to a latent image in a magnetic printing machine comprises a rotatable applicator cylinder disposed around a multipole magnetic stator. The two poles of the stator lying closest to the image are excited with magnetic fields of like polarity to minimize interaction between the magnetic brush field and the recorded magnetic image.
Inventors
- 👤 Ami E. Berkowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:29
CPC Classifications
G; G03; G03G; G03G19/00; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
113 words
An improved machine, adapted for applying and removing particulate, ferromagnetic toner onto a surface of a magnetic recording medium, of the type comprising a multi-pole stator of generally prismatic shape; a hollow applicator cylinder rotatably disposed around the stator; and means for exciting the poles of the stator with magnetic fields; wherein, as an improvement: said stator comprises a plurality of poles radially disposed about the axis of said cylinder; said plurality of poles comprises two principal poles, said principal poles being disposed closer to said surface of said recording medium than the remainder of said plurality of poles; said means adapted for exciting said principal poles with magnetic fields having like orientation.
Claim 2
Dependent Claim
113 words
An improved machine, adapted for applying and removing particulate, ferromagnetic toner onto a surface of a magnetic recording medium, of the type comprising a multi-pole stator of generally prismatic shape; a hollow applicator cylinder rotatably disposed around the stator; and means for exciting the poles of the stator with magnetic fields; wherein, as an improvement: said stator comprises a plurality of poles radially disposed about the axis of said cylinder; said plurality of poles comprises two principal poles, said principal poles being disposed closer to said surface of said recording medium than the remainder of said plurality of poles; said means adapted for exciting said principal poles with magnetic fields having like orientation.
Claim 3
Dependent Claim
19 words
The improved machine of claim 1 wherein said principal poles are equi-distant from said surface of said recording medium.
Claim 4
Dependent Claim
40 words
The improved machine of claim 2 wherein said means are adapted to excite each of said remainder of said poles with a magnetic field having an orientation opposite from the orientation of the magnetic field of each next adjacent pole.
Claim 5
Dependent Claim
36 words
The improved machine of claim 3 wherein said plurality of poles are symmetrically disposed about a plane of symmetry lying normal to said surface of said recording medium and passing through said axis of said cylinder.
Claim 6
Dependent Claim
31 words
The improved machine of claim 4 wherein said remainder of said poles comprise a pole disposed most distant from said surface of said recording medium and in said plane of symmetry.
Claim 7
Dependent Claim
13 words
The improved machine of claim 2 wherein said means are permanent magnet means.
Claim 8
Dependent Claim
9 words
The impoved machine of claim 6 comprising seven poles.
Claim 9
Dependent Claim
21 words
The improved machine of claim 7 wherein said principal poles are disposed on radii of said cylinder forming a right angle.
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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |