US3939448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical magnets of magnetostrictive, remanent, circularly magnetized material
Assignee: Individual
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Filing: 1974-07-12
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Granted: 1976-02-17
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Expires: 1994-07-12
Abstract
Abstract Mechanically controllable magnet made of a magnetostrictive, circularly magnetically anisotropic, circularly magnetized rod. There is no apparent magnetism externally. When rod is twisted, circular anisotropy becomes helical and circular magnetization also becomes helical to produce an axial field component and hence externally apparent magnetism. When rod untwists, it restores itself to its apparently non-magnetic condition.
Inventors
- 👤 Ivan J. Garshelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:44
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/0205; H01F7/0226; H01F7/021
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
45 words
A mechanical magnet, comprising a rod of magnetostrictive, remanent, circularly magnetically anisotropic, circularly magnetized material, and means for twisting said rod, whereby to alter said circular anisotropy to helical anisotropy and thus reorient the circular magnetic field to a helical field with an axial component.
Claim 2
Dependent Claim
45 words
A mechanical magnet, comprising a rod of magnetostrictive, remanent, circularly magnetically anisotropic, circularly magnetized material, and means for twisting said rod, whereby to alter said circular anisotropy to helical anisotropy and thus reorient the circular magnetic field to a helical field with an axial component.
Claim 3
Dependent Claim
52 words
The mechanical magnet of claim 1, further comprising a second magnetostrictive, remanent, circularly magnetically anisotropic, circularly magnetized rod parallel to the first, both said rods being circularly magnetized in the same direction, and means for twisting said second rod in a direction opposite to the direction of twist for said first rod.
Claim 4
Dependent Claim
43 words
The mechanical magnet of claim 2, wherein said means for twisting said rods comprises non-magnetic means for fixing one end of each rod against rotation, and oppositely operable handle means secured to the other ends of said rods for imparting opposite twist thereto.
Claim 5
Dependent Claim
27 words
The mechanical magnet of claim 3, further comprising a ferromagnetic bearing member adjacent said other end of said rods having parallel apertures through which said rods extend.
Claim 6
Dependent Claim
20 words
The mechanical magnet of claim 4, further comprising means for preventing the twist of said rods beyond their elastic limit.
Claim 7
Dependent Claim
23 words
The mechanical magnet of claim 2, wherein one of said rods is tubular and the second rod is coaxial with said first rod.
Claim 8
Dependent Claim
43 words
The mechanical magnet of claim 6, wherein said means for twisting said rods comprises non-magnetic means for fixing one end of each rod against rotation, and oppositely operable handle means secured to the other ends of said rods for imparting opposite twist thereto.
Claim 9
Dependent Claim
25 words
The mechanical magnet of claim 7, further comprising a ferromagnetic plug rotatably mounted in said tubular rod and having said second rod fixedly secured thereto.
Claim 10
Dependent Claim
20 words
The mechanical magnet of claim 8, wherein said tubular rod is made of more twistable material than said second rod.
Claim 11
Dependent Claim
20 words
The mechanical magnet of claim 9, further comprising means for preventing the twist of said rods beyond their elastic limit.
Claim 12
Dependent Claim
18 words
The mechanical magnet of claim 1, wherein said rod is shaped into the form of a lock washer.
Claim 13
Dependent Claim
139 words
The mechanical magnet of claim 1, further comprising a second magnetostrictive, remanent, circularly magnetically anisotropic, circularly magnetized rod having an end in spaced relation to an end of said first rod, both said rods being circularly magnetized in the same direction, and means for twisting said second rod in a direction opposite to the direction of twist of said first rod, whereby to alter the circular anisotrop of said second rod to helical anisotrop having an axial component extending opposite to the axial component of said first rod and thus reorient the circular magnetic field of said second rod to a helical field with an axial component extending opposite to the axial component of said helical field in said twisted first rod, whereby to form said spaced ends of said two rods into magnetic pole pieces of opposite polarity.
Claim 14
Dependent Claim
124 words
The mechanical magnet of claim 1, further comprising a second magnetostrictive, remanent, circularly magnetically anisotropic, circularly magnetized rod having an end in spaced relation to an end of said first rod, both said rods being circularly magnetized, and means for twisting said second rod in a direction to alter the circular anisotrop of said second rod to helical anisotrop having an axial component extending opposite to the axial component of said first rod and thus reorient the circular magnetic field of said second rod to a helical field with an axial component extending opposite to the axial component of said helical field in said twisted first rod, whereby to form said spaced ends of said two rods into magnetic pole pieces of opposite polarity.
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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |