US4544803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positional transducer
Assignee: CERAMIC MAGNETICS Inc 87 FAIRFIELD ROAD FAIRFIELD NEW JERSEY 07006
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Filing: 1984-06-11
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Granted: 1985-10-01
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Expires: 2004-06-11
Abstract
Abstract A positional transducer includes a nonconductive plate having four ferrite tube inductors mounted at preselected locations in the plate. Two interconnected permanent magnets are mounted on either side of the plate with opposite poles facing the plate for magnetic interaction. Manual movement of the permanent magnets varies the impedance of the inductors to indicate the relative position of the magnets to the inductors.
Inventors
- 👤 George E. Schaller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:50
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
132 words
A positional transducer comprising a nonconductive plate, position sensor means including at least two permanent magnets mounted on opposite sides of said plate for movement relative to said plate with the opposite poles of said magnets in magnetic interaction and sensor means mounted at preselected locations relative to said plate to be affected by the magnetic field produced by said permanent magnets, means functionally engaging said magnets to vary the position of said magnets relative to said sensor means to control the relative amount of magnetic flux reaching each sensor means in dependence upon the relative position of the permanent magnets to such sensor means and means coupled to said sensor means for producing at least one output signal indicative of the relative position of the magnets relative to said sensor means.
Claim 2
Dependent Claim
132 words
A positional transducer comprising a nonconductive plate, position sensor means including at least two permanent magnets mounted on opposite sides of said plate for movement relative to said plate with the opposite poles of said magnets in magnetic interaction and sensor means mounted at preselected locations relative to said plate to be affected by the magnetic field produced by said permanent magnets, means functionally engaging said magnets to vary the position of said magnets relative to said sensor means to control the relative amount of magnetic flux reaching each sensor means in dependence upon the relative position of the permanent magnets to such sensor means and means coupled to said sensor means for producing at least one output signal indicative of the relative position of the magnets relative to said sensor means.
Claim 3
Dependent Claim
146 words
A positional transducer comprising a nonconductive plate, four ferrite tube inductors mounted in said plate and oriented along orthogonal coodinates therein, two permanent magnets, each mounted on one side of said plate and coupled for limited movement with respect to said plate with opposite poles of said magnets in magnetic interaction with each other and with said ferrite tube inductors, positional means coupled to said magnets to change the orthogonal position of said magnets relative to said ferrite tube inductors to change the relative amount of magnetic flux reaching each of said ferrite tube inductors in dependence upon the orthogonal position of said positional means, means coupled to said ferrit tube inductors for producing output signals indicative of the orthogonal position of said positional means, electronic means coupled to receive said output signals and producing a further signal for functional control of equipment along orthogonal coordinates.
Claim 4
Dependent Claim
146 words
A positional transducer comprising a nonconductive plate, four ferrite tube inductors mounted in said plate and oriented along orthogonal coodinates therein, two permanent magnets, each mounted on one side of said plate and coupled for limited movement with respect to said plate with opposite poles of said magnets in magnetic interaction with each other and with said ferrite tube inductors, positional means coupled to said magnets to change the orthogonal position of said magnets relative to said ferrite tube inductors to change the relative amount of magnetic flux reaching each of said ferrite tube inductors in dependence upon the orthogonal position of said positional means, means coupled to said ferrit tube inductors for producing output signals indicative of the orthogonal position of said positional means, electronic means coupled to receive said output signals and producing a further signal for functional control of equipment along orthogonal coordinates.
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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |