Patent US4729959A successfully refreshed from Google Patents.
Patent US3214673A successfully refreshed from Google Patents.
US3214673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production and stabilization of low direct voltage
Assignee: US Philips Corp
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Filing: 1961-03-31
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Granted: 1965-10-26
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Expires: 1981-03-31
Abstract
No abstract record available.
Inventors
- 👤 Cock Ludolf Jentje
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:53
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/18; H; H01; H01R; H01R13/00; H01R13/66; H01R13/665; H01R13/6675; H02; H02M; H02M1/00; H02M1/14; H02M7/00; H02M7/02; H02M7/04; H02M7/06; H02M7/066; H02M7/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A TRANSFORMERLESS POWER SUPPLY FOR SUPPLYING AND STABILIZING A LOW DIRECT VOLTAGE COMPRISING: A SOURCE OF ALTERNATING VOLTAGE, SAID SOURCE BEING COUPLED TO THE INPUT OF A FULLWAVE RECTIFIER THROUGH A REACTIVE IMPEDANCE HAVING A RELATIVELY HIGH VALUE, THE OUTPUT OF SAID RECTIFIER BEING COUPLED TO A LOAD IMPEDANCE, A SMOOTHING CAPACITOR HAVING A RELATIVELY LOW REACTIVE IMPEDANCE CONNECTED IN PARALLEL WITH SAID LOAD IMPEDANCE AND SAID RECTIFIER, A VOLTAGE DIVIDER CONNECTED ACROSS SAID LOAD IMPEDANCE, A TRANSISTOR HAVING EMITTER, COLLECTOR AND BASE ELECTRODES, THE EMITTER-COLLECTOR PATH OF SAID TRANSISTOR BEING CONNECTED IN PARALLEL WITH SAID LOAD IMPEDANCE, AND A ZENER DIODE HAVING ONE END CONNECTED TO SAID BASE ELECTRODE AND ANOTHER END CONNECTED TO A TAP OF SAID VOLTAGE DIVIDER FOR STABILIZING THE VOLTAGE ACROSS SAID LOAD IMPEDANCE AT A LOW VALUE COMPARED TO THAT OF SAID SOURCE OF ALTERNATING VOLTAGE.
Claim 2
Dependent Claim
142 words
A TRANSFORMERLESS POWER SUPPLY FOR SUPPLYING AND STABILIZING A LOW DIRECT VOLTAGE COMPRISING: A SOURCE OF ALTERNATING VOLTAGE, SAID SOURCE BEING COUPLED TO THE INPUT OF A FULLWAVE RECTIFIER THROUGH A REACTIVE IMPEDANCE HAVING A RELATIVELY HIGH VALUE, THE OUTPUT OF SAID RECTIFIER BEING COUPLED TO A LOAD IMPEDANCE, A SMOOTHING CAPACITOR HAVING A RELATIVELY LOW REACTIVE IMPEDANCE CONNECTED IN PARALLEL WITH SAID LOAD IMPEDANCE AND SAID RECTIFIER, A VOLTAGE DIVIDER CONNECTED ACROSS SAID LOAD IMPEDANCE, A TRANSISTOR HAVING EMITTER, COLLECTOR AND BASE ELECTRODES, THE EMITTER-COLLECTOR PATH OF SAID TRANSISTOR BEING CONNECTED IN PARALLEL WITH SAID LOAD IMPEDANCE, AND A ZENER DIODE HAVING ONE END CONNECTED TO SAID BASE ELECTRODE AND ANOTHER END CONNECTED TO A TAP OF SAID VOLTAGE DIVIDER FOR STABILIZING THE VOLTAGE ACROSS SAID LOAD IMPEDANCE AT A LOW VALUE COMPARED TO THAT OF SAID SOURCE OF ALTERNATING VOLTAGE.
References Cited (Backward Citations)
US2734162A
Cited
US1829254A
Cited
US2751550A
Cited
US3001120A
Cited
US2881382A
Cited
US2983862A
Cited
US3046466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |