Patent US3201774A successfully refreshed from Google Patents.
US3201774A
Expired / Lapsed
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Electrical sensing apparatus
Assignee: Omron Corp
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Filing: 1962-12-26
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Granted: 1965-08-17
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Expires: 1982-12-26
Abstract
No abstract record available.
Inventors
- 👤 Uemura Mikio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:16
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
ELECTRICAL SENSING APPARATUS COMPRISING AN OSCILLATOR, INCLUDING A TRANSISTOR HAVING AN INDUCTANCE-CAPACITANCE TANK CIRCUIT CONNECTED IN ITS COLLECTOR-TO-BASE CIRCUIT, A RESONANT FEEDBACK CIRCUIT CONNECTED BETWEEN THE EMITTER OF SAID TRANSISTOR AND GROUND AND COMPRISING INDUCTIVE AND CAPACITIVE ELEMENTS, AND A FEEDBACK CONNECTION BETWEEN GROUND AND SAID TANK CIRCUIT, A DETECTOR UNIT INCLUDING ONE OF THE LEEMENTS OF SAID FEEDBACK CIRCUIT AND HAVING A FIELD THEREABOUT THE PRESENCE OF AN OBJECT IN WHICH CAUSES FEEDBACK IMPEDANCE OF SAID CIRCUIT TO CHANGE THROUGH A CRITICAL VALUE NECESSARY FOR MAINTENANCE OF OSCILLATIONS, AND INDICATOR MEANS CONNECTED TO SAID EMITTER AND RESPONSIVE TO PREDETERMINED CHANGES IN OSCILLATION CONDITIONS IN SAID OSCILLATOR.
Claim 2
Dependent Claim
107 words
ELECTRICAL SENSING APPARATUS COMPRISING AN OSCILLATOR, INCLUDING A TRANSISTOR HAVING AN INDUCTANCE-CAPACITANCE TANK CIRCUIT CONNECTED IN ITS COLLECTOR-TO-BASE CIRCUIT, A RESONANT FEEDBACK CIRCUIT CONNECTED BETWEEN THE EMITTER OF SAID TRANSISTOR AND GROUND AND COMPRISING INDUCTIVE AND CAPACITIVE ELEMENTS, AND A FEEDBACK CONNECTION BETWEEN GROUND AND SAID TANK CIRCUIT, A DETECTOR UNIT INCLUDING ONE OF THE LEEMENTS OF SAID FEEDBACK CIRCUIT AND HAVING A FIELD THEREABOUT THE PRESENCE OF AN OBJECT IN WHICH CAUSES FEEDBACK IMPEDANCE OF SAID CIRCUIT TO CHANGE THROUGH A CRITICAL VALUE NECESSARY FOR MAINTENANCE OF OSCILLATIONS, AND INDICATOR MEANS CONNECTED TO SAID EMITTER AND RESPONSIVE TO PREDETERMINED CHANGES IN OSCILLATION CONDITIONS IN SAID OSCILLATOR.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |