Patent US3854084A successfully refreshed from Google Patents.
US3854084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic object comparator using inductive sensors and frequency comparison
Assignee: Individual
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Filing: 1973-05-14
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Granted: 1974-12-10
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Expires: 1993-05-14
Abstract
Abstract An electronic comparator having two coils, each formed to receive one of two workpieces to be compared and connected through circuitry to the horizontal and vertical sweeps of a cathode ray oscilloscope.
Inventors
- 👤 E Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:03
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/12; G01B; G01B7/00; G01N; G01N27/00; G01N27/72; G01N27/82; G01N27/90; G01N27/9046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
An electronic comparator, comprising a. a first coil having a predetermined inductance, b. a second coil adapted to receive a workpiece to be tested and having when said workpiece is received suBstantially the same predetermined inductance, c. a first circuit connected to the first coil, the first circuit having a first-point and delivering to an output lead a signal whose frequency and phase is indicative of the inductance of the first coil, d. a second circuit connected to the second coil, said second circuit being substantially the same as said first circuit and having a second point located at a point in said second circuit structurally corresponding to the first point in said first circuit and delivering to an output lead a signal whose frequency and phase is indicative of the inductance of the second coil, e. a means for comparing the frequencies at the output leads, the means being in a first indicating state when the frequencies are equal, and a second indicating state when the frequencies are not equal, and f. an electrical coupling between the first and the second points, the coupling containing a capacitor, and being nongrounded for signals of the frequencies delivered by the circuits.
Claim 2
Dependent Claim
200 words
An electronic comparator, comprising a. a first coil having a predetermined inductance, b. a second coil adapted to receive a workpiece to be tested and having when said workpiece is received suBstantially the same predetermined inductance, c. a first circuit connected to the first coil, the first circuit having a first-point and delivering to an output lead a signal whose frequency and phase is indicative of the inductance of the first coil, d. a second circuit connected to the second coil, said second circuit being substantially the same as said first circuit and having a second point located at a point in said second circuit structurally corresponding to the first point in said first circuit and delivering to an output lead a signal whose frequency and phase is indicative of the inductance of the second coil, e. a means for comparing the frequencies at the output leads, the means being in a first indicating state when the frequencies are equal, and a second indicating state when the frequencies are not equal, and f. an electrical coupling between the first and the second points, the coupling containing a capacitor, and being nongrounded for signals of the frequencies delivered by the circuits.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |