Patent US3555534A successfully refreshed from Google Patents.
US3555534A
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Proximity detector with a sensing probe
Assignee: Boeing North American Inc
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Filing: 1967-03-10
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Granted: 1971-01-12
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Expires: 1987-03-10
Abstract
Abstract A PROXIMITY DETECTOR HAVING PREFERABLY A SINGLE CAPACITIVE SENSING PROBE IN WHICH THE CAPACITANCE THEREOF CHANGES WITH MOVEMENT OF MATTER WITHIN THE CAPACITIVE FIELD TO CHANGE THE VOLTAGE OF THE OSCILLATING CURRENT IN THE PROBE. SINCE THIS VOLTAGE IS ALSO DEPENDENT ON THE VOLTAGE OF THE ENERGIZING SOURCE, MEANS ARE PROVIDED TO OBSERVE ONLY RELATIVE CHANGES BETWEEN THE VOLTAGES TO PRODUCE AN ALARM WHEN THIS PHENOMENON OCCURS.
Inventors
- 👤 Artie E Akers
- 👤 Robert W Schonle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:22
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/955; G; G08; G08B; G08B13/00; G08B13/22; G08B13/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |