Patent US4907788A successfully refreshed from Google Patents.
US3786458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-contacting angular position detector
Assignee: SEC DEP TRANSPORTATION
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Filing: 1972-03-01
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Granted: 1974-01-15
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Expires: 1992-03-01
Abstract
Abstract The angle between a small radio frequency coil and a spatially uniform magnetic field is measured and a signal commensurate with the measured angle is employed in a computation of angular position. The apparatus employed in the angle measurement is characterized by a DC frequency response whereby an output signal is produced in the absence of motion between the coil and field.
Inventors
- 👤 J Horner
- 👤 G Plank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:19
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; A; A61; A61B; A61B5/00; A61B5/103; A61B5/11; A61B5/1116; A61B5/1121; G01M; G01M99/00; Y; Y10; Y10S; Y10S128/00; Y10S128/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A position transducer system comprising: generating coil means for generating a reference magnetic field, said reference field having an axis; magnetic field responsive means comprising pickup coil means having a core of magnetic material and capacitor means connected in parallel with said coil means to define a parallel resonant circuit, said field responsive means positioned remotely from said generating coil means to minimize the response due to any linear motions between said generating coil means and said field responsive means, said field responsive means providing an electrical output signal proportional to the sine of the angle between said field responsive means and said reference field axis; receiving means connected to said field responsive means comprising input amplifier means having a high input impedance, a demodulator and output amplifier means having a low output impedance, said receiving means providing an electrical signal indicative of the angular orientation of said field responsive means.
Claim 2
Dependent Claim
151 words
A position transducer system comprising: generating coil means for generating a reference magnetic field, said reference field having an axis; magnetic field responsive means comprising pickup coil means having a core of magnetic material and capacitor means connected in parallel with said coil means to define a parallel resonant circuit, said field responsive means positioned remotely from said generating coil means to minimize the response due to any linear motions between said generating coil means and said field responsive means, said field responsive means providing an electrical output signal proportional to the sine of the angle between said field responsive means and said reference field axis; receiving means connected to said field responsive means comprising input amplifier means having a high input impedance, a demodulator and output amplifier means having a low output impedance, said receiving means providing an electrical signal indicative of the angular orientation of said field responsive means.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |