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US3858136A
Expired / Lapsed
US
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Apparatus for multipolar magnetization
Assignee: Yamauchi Rubber Industry Co Ltd
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Filing: 1973-12-05
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Granted: 1974-12-31
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Expires: 1993-12-05
Abstract
Abstract An apparatus comprises an annular magnetically permeable main body having a width not smaller than the width of a sheet to be magnetized and formed with a small gap. The magnetically permeable body has a conductor wound therearound and a pair of magnetic poles opposing each other with the gap interposed therebetween. Alternating current is passed through the conductor to magnetize the sheet for use in the manufacture of flexible permanent magnets which is continuously travelled on the pair of magnetic poles.
Inventors
- 👤 S Jun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:02
CPC Classifications
H; H01; H01F; H01F13/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
108 words
An apparatus for multipolar magnetization for use in the manufacture of flexible permanent magnets, comprising an annular, magnetically permeable body formed with a gap and having a width not smaller than the width of a sheet to be magnetized, a conductor wound around said body and connected to an alternating current source to thereby pass constant exciting current of constant frequency therethrough and a pair of magnetic poles opposing each other with said gap which measures from 1 to 2.5 mm in size interposed therebetween and each of said poles having a surface to be positioned face-to-face with said sheet as the sheet travels continuously thereover for magnetization.
Claim 2
Independent Claim
108 words
An apparatus for multipolar magnetization for use in the manufacture of flexible permanent magnets, comprising an annular, magnetically permeable body formed with a gap and having a width not smaller than the width of a sheet to be magnetized, a conductor wound around said body and connected to an alternating current source to thereby pass constant exciting current of constant frequency therethrough and a pair of magnetic poles opposing each other with said gap which measures from 1 to 2.5 mm in size interposed therebetween and each of said poles having a surface to be positioned face-to-face with said sheet as the sheet travels continuously thereover for magnetization.
Claim 3
Dependent Claim
14 words
The apparatus as set forth in claim 1 wherein said frequency is 50 hz.
Claim 4
Dependent Claim
18 words
a width, measured in parallel to said axis, which is not smaller than the width of said sheet,
Claim 5
Dependent Claim
18 words
a width, measured in parallel to said axis, which is not smaller than the width of said sheet,
Claim 6
Dependent Claim
16 words
The apparatus as set forth in claim 1 wherein said gap is packed with synthetic resin.
Claim 7
Dependent Claim
78 words
a pair of magnetic poles in parallel and opposed relationship and disposed in parallel to said axis, said poles having a gap therebetween measuring from 1 to 2.5 mm and each of said poles having a flat surface disposed in parallel to said axis, said flat surfaces being in a common plane, and B. a conductor which is wound around said body and is connected to a source of uninterrupted alternating current of constant frequency, amperage, and voltage.
Claim 8
Dependent Claim
78 words
a pair of magnetic poles in parallel and opposed relationship and disposed in parallel to said axis, said poles having a gap therebetween measuring from 1 to 2.5 mm and each of said poles having a flat surface disposed in parallel to said axis, said flat surfaces being in a common plane, and B. a conductor which is wound around said body and is connected to a source of uninterrupted alternating current of constant frequency, amperage, and voltage.
Claim 9
Independent Claim
28 words
An apparatus for multipolar magnetization for use in the continuous manufacture of flexible permanent magnets from a continuously moving sheet, comprising: A. an annular, magnetically permeable body, having:
Claim 10
Independent Claim
28 words
An apparatus for multipolar magnetization for use in the continuous manufacture of flexible permanent magnets from a continuously moving sheet, comprising: A. an annular, magnetically permeable body, having:
Claim 11
Dependent Claim
75 words
The apparatus of claim 4 wherein said apparatus is capable of generating an attracting force of 40 g/2cm2 in said sheet when said gap is 1 mm in size, said frequency is 50 Hz, said voltage is 200 voLts, said amperage is 3 amperes, and said sheet is formed of a flexible material incorporating barium ferrite powder therein, has a thickness of 0.6 mm, and travels at 8 meters per minute over said flat surfaces.
Claim 12
Independent Claim
92 words
The method of continuously generating at least 40 g/2cm2 in a sheet of flexible material containing a powdered magnetic material and having a thickness of about 0.6 millimeters comprising passing said sheet continuously at a speed of about 8 meters per minute over a pair of closely adjacent magnetic poles which lie in a common plane and are separated by a gap of 1-2.5 millimeters and generate a magnetic flux created by a constant alternating current frequency of 50 Hz, a constant voltage of 200 volts, and an amperage of 3 amps.
Claim 13
Independent Claim
92 words
The method of continuously generating at least 40 g/2cm2 in a sheet of flexible material containing a powdered magnetic material and having a thickness of about 0.6 millimeters comprising passing said sheet continuously at a speed of about 8 meters per minute over a pair of closely adjacent magnetic poles which lie in a common plane and are separated by a gap of 1-2.5 millimeters and generate a magnetic flux created by a constant alternating current frequency of 50 Hz, a constant voltage of 200 volts, and an amperage of 3 amps.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |