Patent US3174056A successfully refreshed from Google Patents.
US3174056A
Expired / Lapsed
US
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Transistor bi-stable proximity sensor
Assignee: Unisys Corp
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Filing: 1961-04-18
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Granted: 1965-03-16
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Expires: 1981-04-18
Abstract
No abstract record available.
Inventors
- 👤 Lionel E Leavitt
- 👤 Ordorica Vincent
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:10
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; B; B66; B66B; B66B1/00; B66B1/34; B66B1/46; B66B1/50; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/487; H; H03; H03K; H03K17/00; H03K17/94; H03K17/945; H03K17/95; H03K17/952; H03K17/9537; H03K17/9542; H03K17/9547
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROXIMITY DEVICE COMPRISING A CORE HAVING AN INDUCTANCE COIL WOUND THEREON, A STEP-UP TRANSFORMER HAVING A PRIMARY AND A SECONDARY WINDING, A VOLTAGE SOURCE CONNECTED TO ONE SIDE OF SAID COIL, THE OTHER SIDE OF SAID COIL BEING CONNECTED TO ONE SIDE OF SAID PRIMARY WINDING, A TANK CAPACITOR SHUNTING SAID COIL AND PRIMARY WINDING, AN OSCILLATOR TRANSISTOR HAVING A COLLECTOR, EMITTER AND BASE ELECTRODES, SAID COLLECTOR ELECTRODE BEING CONNECTED TO THE OTHER SIDE OF SAID PRIMARY WINDING, FIRST CONDUCTOR CONNECTING SAID TANK CAPACITOR TO SAID BASE, A BIASING RESISTOR IN SAID FIRST CONDUCTOR, A SECOND CONDUCTOR CONNECTING THE EMITTER ELECTRODE TO GROUND, AN EMITTER RESISTOR IN SAID SECOND CONDUCTOR, A CONDUCTOR CONNECTING ONE SIDE OF THE SECONDARY WINDING TO THE BASE ELECTRODE OF SAID TRANSISTOR AND A GROUNDED CONDUCTOR CONNECTING THE OTHER SIDE OF SAID SECONDARY WINDING TO GROUND.
Claim 2
Dependent Claim
141 words
A PROXIMITY DEVICE COMPRISING A CORE HAVING AN INDUCTANCE COIL WOUND THEREON, A STEP-UP TRANSFORMER HAVING A PRIMARY AND A SECONDARY WINDING, A VOLTAGE SOURCE CONNECTED TO ONE SIDE OF SAID COIL, THE OTHER SIDE OF SAID COIL BEING CONNECTED TO ONE SIDE OF SAID PRIMARY WINDING, A TANK CAPACITOR SHUNTING SAID COIL AND PRIMARY WINDING, AN OSCILLATOR TRANSISTOR HAVING A COLLECTOR, EMITTER AND BASE ELECTRODES, SAID COLLECTOR ELECTRODE BEING CONNECTED TO THE OTHER SIDE OF SAID PRIMARY WINDING, FIRST CONDUCTOR CONNECTING SAID TANK CAPACITOR TO SAID BASE, A BIASING RESISTOR IN SAID FIRST CONDUCTOR, A SECOND CONDUCTOR CONNECTING THE EMITTER ELECTRODE TO GROUND, AN EMITTER RESISTOR IN SAID SECOND CONDUCTOR, A CONDUCTOR CONNECTING ONE SIDE OF THE SECONDARY WINDING TO THE BASE ELECTRODE OF SAID TRANSISTOR AND A GROUNDED CONDUCTOR CONNECTING THE OTHER SIDE OF SAID SECONDARY WINDING TO GROUND.
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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) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |