Patent US3928987A successfully refreshed from Google Patents.
Patent US4237349A successfully refreshed from Google Patents.
US4237349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact moving-coil pickup of low weight and high quality
Assignee: ORTOFON Manufacturing AS
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Filing: 1978-12-28
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Granted: 1980-12-02
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Expires: 1998-12-28
Abstract
Abstract In a moving-coil pickup having a flat, wound armature which is fixed to a stylus arm and is movably mounted in a magnet field produced by one or more permanent magnets, said magnet or magnets is/are so arranged as to define a relatively short tube within which the armature is mounted.
Inventors
- 👤 Bjarne S. Hansen
- 👤 Robert Gudmandsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:52
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/12; H04R9/16
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A moving-coil pickup comprising a relatively flat armature including at least one winding, a stylus arm to which said armature is fixed, and at least one permanent magnet for producing a magnetic field in which said armature is tiltably mounted, wherein said at least one permanent magnet comprises at least one part of a relatively short tube at least partly enclosing, and being substantially coaxial with, the armature.
Claim 2
Dependent Claim
68 words
A moving-coil pickup comprising a relatively flat armature including at least one winding, a stylus arm to which said armature is fixed, and at least one permanent magnet for producing a magnetic field in which said armature is tiltably mounted, wherein said at least one permanent magnet comprises at least one part of a relatively short tube at least partly enclosing, and being substantially coaxial with, the armature.
Claim 3
Dependent Claim
52 words
A pickup according to claim 1, said at least one permanent magnet having an axis, comprising yokes placed on the ends of said at least one permanent magnet, wherein said yokes have portions which extend toward the axis and form two spaced substantially parallel pole faces between which the armature is mounted.
Claim 4
Dependent Claim
36 words
A pickup according to claim 2, wherein said at least one permanent magnet defines a cavity, and wherein the portions of the yokes extend axially into the cavity defined by the at least one permanent magnet.
Claim 5
Dependent Claim
43 words
A pickup according to claim 1, wherein said at least one permanent magnet defines a cavity, and wherein said at least one permanent magnet is tubular, and wherein said at least one permanent magnet defines a cross-section of the cavity which is circular.
Claim 6
Dependent Claim
56 words
A pickup according to claim 1, wherein said at least one permanent magnet defines a cavity, and wherein said at least one permanent magnet is tubular, and wherein said at least one permanent magnet defines a cross-section of the cavity which is square with substantially vertical and horizontal diagonals in the operating position of the pickup.
Claim 7
Dependent Claim
71 words
A pickup according to claim 5, wherein said at least one permanent magnet defines a cross-section having an outer contour which is rectangular, and wherein said cavity has a contour, and wherein said at least one permanent magnet has a rectangular contour, said cross-sectional square contour of said cavity and said rectangular contour of said at least one permanent magnet forming an angle of approximately 45° with respect to each other.
Claim 8
Dependent Claim
33 words
A pickup according to claim 1, wherein said at least one permanent magnet is tubular, and wherein said at least one permanent magnet defines a cross-section having an outer contour which is circular.
Claim 9
Dependent Claim
33 words
A pickup according to claim 1, wherein said at least one permanent magnet is tubular, and wherein said at least one permanent magnet defines a cross-section having an outer contour which is rectangular.
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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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |