Patent US4145944A successfully refreshed from Google Patents.
US4145944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Guitar pick-up apparatus
Assignee: Individual
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Filing: 1978-01-23
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Granted: 1979-03-27
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Expires: 1998-01-23
Abstract
Abstract A pick-up for attachment to a guitar or the like is disclosed. The pick-up comprises an elongate flexible body having a thin, lower, magnetic base which affixes to the body of the guitar with an adhesive, the base comprising a sheet magnet. The sheet magnet is cut in the form of a rectangle, and it approximately matches the profile of a second sheet magnet cut in approximately the same rectangular shape. The second magnet serves as a core for supporting a coil wrapped around it on the periphery. The magnet and the coil wrapped around it are together sandwiched between opposite layers of sheet tin foil to serve as shielding. This, in turn, is placed in a plastic body which is shrink-wrapped around the turns of the coil. The lower magnet adhesively affixed to the body transfers vibrations from the body into the coil in the form of electrical signals. In addition, strings made of magnetic material co-act with the upper magnet to additionally form electrical signals. These two signal sources provide a high fidelity pick-up system whereby music is converted into an electrical signal from the guitar which is amplified by other equipment.
Inventors
- 👤 II Charles T. Helpinstill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:08
CPC Classifications
G; G10; G10H; G10H3/00; G10H3/12; G10H3/14; G10H3/18; G10H3/181
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A pick-up for a stringed instrument having an acoustic body which comprises: (a) a first flexible magnet adapted to be attached to the acoustic body of a stringed instrument; (b) a second flexible magnetic body forming magnetic lines of flux which co-act with strings of the instrument to form magnetic field disturbances; (c) a wound coil which is positioned such that the magnetic field of the second magnet is disturbed for the purpose of forming an electrical signal in said coil as a result of the movement of the strings of the musical instrument; (d) said first magnet being sufficiently flexible and movable when mounted on the acoustic body to impart vibrations from the body to a magnetic field formed by said first magnet such that an electrical signal is formed in said coil which is at least partly dependent on the vibrations in said acoustic body; (e) an adhesive means for joining said first magnet to the acoustic body; and (f) a second adhesive means for joining the first magnet to the second magnet.
Claim 2
Dependent Claim
175 words
A pick-up for a stringed instrument having an acoustic body which comprises: (a) a first flexible magnet adapted to be attached to the acoustic body of a stringed instrument; (b) a second flexible magnetic body forming magnetic lines of flux which co-act with strings of the instrument to form magnetic field disturbances; (c) a wound coil which is positioned such that the magnetic field of the second magnet is disturbed for the purpose of forming an electrical signal in said coil as a result of the movement of the strings of the musical instrument; (d) said first magnet being sufficiently flexible and movable when mounted on the acoustic body to impart vibrations from the body to a magnetic field formed by said first magnet such that an electrical signal is formed in said coil which is at least partly dependent on the vibrations in said acoustic body; (e) an adhesive means for joining said first magnet to the acoustic body; and (f) a second adhesive means for joining the first magnet to the second magnet.
Claim 3
Dependent Claim
164 words
A pick-up for a stringed instrument having an acoustic body which comprises: (a) a first flexible magnet adapted to be attached to the acoustic body of a stringed instrument; (b) a second flexible magnetic body forming magnetic lines of flux which co-act with strings of the instrument to form magnetic field disturbances; (c) a wound coil which is positioned such that the magnetic field of the second magnet is disturbed for the purpose of forming an electrical signal in said coil as a result of the movement of the strings of the musical instrument; (d) said first magnet being sufficiently flexible and movable when mounted on the acoustic body to impart vibrations from the body to a magnetic field formed by said first magnet such that an electrical signal is formed in said coil which is at least partly dependent on the vibrations in said acoustic body; and (e) a metallic shield of nonferromagnetic material surrounding said coil to provide an electrostatic shield thereabout.
Claim 4
Dependent Claim
164 words
A pick-up for a stringed instrument having an acoustic body which comprises: (a) a first flexible magnet adapted to be attached to the acoustic body of a stringed instrument; (b) a second flexible magnetic body forming magnetic lines of flux which co-act with strings of the instrument to form magnetic field disturbances; (c) a wound coil which is positioned such that the magnetic field of the second magnet is disturbed for the purpose of forming an electrical signal in said coil as a result of the movement of the strings of the musical instrument; (d) said first magnet being sufficiently flexible and movable when mounted on the acoustic body to impart vibrations from the body to a magnetic field formed by said first magnet such that an electrical signal is formed in said coil which is at least partly dependent on the vibrations in said acoustic body; and (e) a metallic shield of nonferromagnetic material surrounding said coil to provide an electrostatic shield thereabout.
Claim 5
Dependent Claim
39 words
The apparatus of claim 2 including an elongate shrink-fit plastic sleeve encasing said second magnet, coil and electrostatic shield therein and including a sleeve which encloses a pair of wires extending remotely therefrom which are connected to said coil.
Claim 6
Dependent Claim
27 words
The apparatus of claim 3 wherein said first and second magnets are formed of plastic material and have magnetic poles on the upper and lower faces thereof.
Claim 7
Dependent Claim
41 words
The apparatus of claim 4 wherein said first magnet is adhesively joined to said plastic sleeve and forms a unitary structure of generally rectangular shape which is flexible and bendable so that it is able to deflect along the length thereof.
Claim 8
Dependent Claim
26 words
The apparatus of claim 5 wherein said rectangular structure has a length at least spanning the total width of all the strings on the stringed instrument.
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) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |