US3571483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable reluctance guitar pickup system
Assignee: Marmon Co
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Filing: 1970-02-02
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Granted: 1971-03-16
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Expires: 1990-02-02
Abstract
Abstract A variable reluctance guitar pickup system which provides six individual pickups for the six steel strings, each developing an output voltage with string movement which is substantially insensitive to the plane of string vibration. The pickups have a central post of one magnetic polarity and a U-shaped enclosing yoke of opposite polarity. The string passes centrally through the yoke such that displacement of the string in any direction changes the reluctance of the magnetic circuit to which a pickup coil is sensitive. The yokes, all of the same polarity, provide extremely high isolation of the individual magnetic circuits and sound signals. The organization provides for ease of assembly and ready removability and replacement of the individual pickups which are in cartridge form and interchangeable.
Inventors
- 👤 Peter Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:28
CPC Classifications
G; G10; G10H; G10H3/00; G10H3/12; G10H3/14; G10H3/18; G10H3/181
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
123 words
An electrical pickup system for a stringed musical instrument having strings of magnetic material comprising means providing a pole of magnetic material at one side of a string in proximity thereto, means providing a yoke of magnetic material having a portion in proximity to said string enclosing a length of said string in the region of said pole and on substantially all sides of said string other than the said one side, means providing a magnetic circuit between said pole and said yoke, said magnetic circuit including permanent magnet means for providing a magnetic polarity at said pole opposite the magnetic polarity of the yoke portion in proximity to said string, and a pickup coil secured in inductive relation to said magnetic circuit.
Claim 2
Dependent Claim
123 words
An electrical pickup system for a stringed musical instrument having strings of magnetic material comprising means providing a pole of magnetic material at one side of a string in proximity thereto, means providing a yoke of magnetic material having a portion in proximity to said string enclosing a length of said string in the region of said pole and on substantially all sides of said string other than the said one side, means providing a magnetic circuit between said pole and said yoke, said magnetic circuit including permanent magnet means for providing a magnetic polarity at said pole opposite the magnetic polarity of the yoke portion in proximity to said string, and a pickup coil secured in inductive relation to said magnetic circuit.
Claim 3
Dependent Claim
24 words
The pickup system of claim 1 in which said yoke in the dimension parallel to said string extends beyond said pole in both directions.
Claim 4
Dependent Claim
24 words
The pickup system of claim 1 in which said string when at rest is equal or closer to said pole than to said yoke.
Claim 5
Dependent Claim
25 words
The pickup system of claim 3 in which said string when at rest is substantially equidistant from said yoke through out half the string circumference.
Claim 6
Dependent Claim
20 words
The pickup system of claim 1 in which said yoke encloses said pole, said permanent magnet means and said coil.
Claim 7
Dependent Claim
24 words
The pickup system of claim 2 in which said string when at rest is equal or closer to said pole than to said yoke.
Claim 8
Dependent Claim
30 words
The pickup system of claim 6 in which said string when at rest is substantially equidistant from said yoke throughout half the string circumference on the side opposite said pole.
Claim 9
Dependent Claim
143 words
An electrical pickup system for a guitar with strings comprising a chassis for securement to guitar, a plurality of bridge string supports secured to said chassis, said chassis having a plurality of pickup cartridge mounting elements individually in vertical planes passing through strings supported by said string suppoRts, said mounting elements all being individually the same distance from their respective strings, and a plurality of identical pickup cartridges, one for each string of the guitar, comprising means providing a pole of magnetic material at one side of a string in proximity thereto and means providing a yoke of magnetic material having a portion in proximity to last-mentioned string enclosing a length of said string in the region of said pole and on substantially all sides of said string other than the said one side, said pickup cartridges removably secured to said mounting elements.
Claim 10
Dependent Claim
143 words
An electrical pickup system for a guitar with strings comprising a chassis for securement to guitar, a plurality of bridge string supports secured to said chassis, said chassis having a plurality of pickup cartridge mounting elements individually in vertical planes passing through strings supported by said string suppoRts, said mounting elements all being individually the same distance from their respective strings, and a plurality of identical pickup cartridges, one for each string of the guitar, comprising means providing a pole of magnetic material at one side of a string in proximity thereto and means providing a yoke of magnetic material having a portion in proximity to last-mentioned string enclosing a length of said string in the region of said pole and on substantially all sides of said string other than the said one side, said pickup cartridges removably secured to said mounting elements.
Claim 11
Dependent Claim
43 words
The pickup system of claim 8 in which said chassis and said pickup cartridges have mutually engaging electrical terminal adapted to engage when said cartridges are secured to said mounting elements and to separate when said cartridges are removed form said mounting elements.
Claim 12
Dependent Claim
19 words
The pickup system of claim 8 in which said bridge string supports are individually longitudinally adjustable on said chassis.
Claim 13
Dependent Claim
23 words
The pickup system of claim 8 in which said chassis is vertically adjustable to provide proper string positioning relative to the guitar frets.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |