US3230519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive sensing device
Assignee: Tamar Electronics Industries Inc
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Filing: 1964-02-13
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Granted: 1966-01-18
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Expires: 1984-02-13
Abstract
No abstract record available.
Inventors
- 👤 Ramey B Metz
- 👤 Stanley M Kerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:09
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/955
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
IN A CAPACITIVE SENSOR, A CAPACITIVE BRIDGE CIRCUIT, A CAPACITIVE SENSING HEAD FORMING ONE OF LEGS OF SAID BRIDGE CIRCUIT, IMPEDANCE MEANS FORMING THE BRIDGING ELEMENT OF SAID BRIDGE CIRCUIT, AN OSCILLATORY SIGNAL SOURCE CONNECTED ACROSS SAID BRIDGE CIRCUIT, UNI-DIRECTIONAL CURRENT MEANS CONNECTED ACROSS SAID SENSING HEAD FOR ESTABLISHING A REFERENCE VOLTAGE AT ONE OF THE ENDS OF SAID BRIDGING ELEMENT, OUTPUT MEANS, MEANS FOR COUPLING SAID REFERENCE POTENTIAL TO SAID OUTPUT MEANS, AND UNI-DIRECTIONAL CURRENT MEANS FOR FEEDING A SIGNAL FROM THE OTHER END OF SAID BRIDGING ELEMENT TO SAID OUTPUT MEANS, WHEREBY WHEN THERE ARE NO OBJECTS BEFORE SAID SENSING HEAD, THE REFERENCE VOLTAGE IS SUBSTANTIALLY EQUAL AND OPPOSITE TO SAID SIGNAL RESULTING IN ZERO NET OUTPUT TO SAID OUTPUT MEANS, AND WHEN OBJECTS APPEAR IN THE VICINITY OF SAID SENSING HEAD, SAID REFERENCE VOLTAGE DECREASES RESULTING IN AN OUTPUT SIGNAL TO SAID OUTPUT MEANS.
Claim 2
Dependent Claim
147 words
IN A CAPACITIVE SENSOR, A CAPACITIVE BRIDGE CIRCUIT, A CAPACITIVE SENSING HEAD FORMING ONE OF LEGS OF SAID BRIDGE CIRCUIT, IMPEDANCE MEANS FORMING THE BRIDGING ELEMENT OF SAID BRIDGE CIRCUIT, AN OSCILLATORY SIGNAL SOURCE CONNECTED ACROSS SAID BRIDGE CIRCUIT, UNI-DIRECTIONAL CURRENT MEANS CONNECTED ACROSS SAID SENSING HEAD FOR ESTABLISHING A REFERENCE VOLTAGE AT ONE OF THE ENDS OF SAID BRIDGING ELEMENT, OUTPUT MEANS, MEANS FOR COUPLING SAID REFERENCE POTENTIAL TO SAID OUTPUT MEANS, AND UNI-DIRECTIONAL CURRENT MEANS FOR FEEDING A SIGNAL FROM THE OTHER END OF SAID BRIDGING ELEMENT TO SAID OUTPUT MEANS, WHEREBY WHEN THERE ARE NO OBJECTS BEFORE SAID SENSING HEAD, THE REFERENCE VOLTAGE IS SUBSTANTIALLY EQUAL AND OPPOSITE TO SAID SIGNAL RESULTING IN ZERO NET OUTPUT TO SAID OUTPUT MEANS, AND WHEN OBJECTS APPEAR IN THE VICINITY OF SAID SENSING HEAD, SAID REFERENCE VOLTAGE DECREASES RESULTING IN AN OUTPUT SIGNAL TO SAID OUTPUT MEANS.
References Cited (Backward Citations)
US2525769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |