Patent US3688290A successfully refreshed from Google Patents.
US3688290A
Expired / Lapsed
US
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Telemetering system
Assignee: Linde Sverige AB
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Filing: 1971-03-19
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Granted: 1972-08-29
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Expires: 1991-03-19
Abstract
Abstract A telemetering system for providing indications of various states of an object, such as its position, motion or rate of rotation. A core of soft magnetic material comprising the inductance of a high frequency tuned circuit is influenced by the magnetic field of a permanent magnet that is affixed to said object and that moves towards and away from the core, respectively, with the magnetic field generated by said permanent magnet premagnetizing said core so as to affect the attenuation of the tuned circuit, thereby influencing an output signal that comprises an indication of a measured value, i.e., indication of the state of said object.
Inventors
- 👤 Palle-Finn Beer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:49
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/2006; G01D5/2033; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/487
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
169 words
A telemetering system for indicating various states of an object, such as its location, motion or rate of rotation, comprising a. magnetic source means for generating a magnetic field affixed to said object, b. soft magnetic core means, c. first tuned circuit means including a first coil that surrounds said core means, d. amplifier means having an input and an output, respectively, and e. second tuned circuit means including a second coil, said first tuned circuit means being connected to the input of said amplifier means for making said amplifier means selfoscillate in response to the state of magnetization of said core means caused by said magnetic field and said second tuned circuit means being connected to the output of said amplifier means, with the attenuation of said first tuned circuit means being an inverse function of the field intensity induced in the core means by said source means And with the signal transmitted from the telemetering system being responsive to the degree of attenuation of said core means.
Claim 2
Dependent Claim
169 words
A telemetering system for indicating various states of an object, such as its location, motion or rate of rotation, comprising a. magnetic source means for generating a magnetic field affixed to said object, b. soft magnetic core means, c. first tuned circuit means including a first coil that surrounds said core means, d. amplifier means having an input and an output, respectively, and e. second tuned circuit means including a second coil, said first tuned circuit means being connected to the input of said amplifier means for making said amplifier means selfoscillate in response to the state of magnetization of said core means caused by said magnetic field and said second tuned circuit means being connected to the output of said amplifier means, with the attenuation of said first tuned circuit means being an inverse function of the field intensity induced in the core means by said source means And with the signal transmitted from the telemetering system being responsive to the degree of attenuation of said core means.
Claim 3
Dependent Claim
56 words
A system in accordance with claim 1, wherein said source comprises a permanent magnet which is affixed to a rotatable member and which provides an angularly responsive premagnetization of the core means so as to cause the amplifier means to self-oscillate and to cease self-oscillating, respectively, one or more times per revolution of said rotatable member.
Claim 4
Dependent Claim
47 words
A system in accordance with claim 1, wherein a direct current supplied to the amplifier means generates a voltage drop over a resistor which at a terminal to which the resistor is connected provides a voltage with a level responsive to the oscillating state of the amplifier.
References Cited (Backward Citations)
US2918666A
Cited
US2907991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |