Patent US3305739A successfully refreshed from Google Patents.
US3305739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase shifting apparatus for controlled pulsing of controlled rectifiers
Assignee: Sprague Electric Co
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Filing: 1966-01-27
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Granted: 1967-02-21
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Expires: 1986-01-27
Abstract
No abstract record available.
Inventors
- 👤 Nicholas G Muskovac
- 👤 Walter J Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:53
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/08; H02M1/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
AN APPARATUS FOR CONTROLLING THE INITIATION OF FIRING PULSES TO THE GATE OF A CONTROLLED RECTIFIER ENERGIZED FROM AN ALTERNATING CURRENT SOURCE, COMPRISING AT LEAST ONE TRANSISTOR HAVING ITS EMITTER-COLLECTOR CIRCUIT IN CONNECTION TO SAID GATE, A FIRST UNIDIRECTIONAL CURRENT MEANS CONNECTING SAID TRANSISTOR TO SAID SOURCE AND PROVIDING A PULSATING FORWARD EMITTER-COLLECTOR BIAS THEREON, A VARIABLE PHASE SHIFTING MEANS COUPLED TO SAID SOURCE, SAID PHASE SHIFTING MEANS PROVIDING AT THE OUTPUT THEREOF AN ALTERNATING CURRENT OF VARIABLE PHASE ANGLE AND A SUBSTANTIALLY SINUSODIAL WAVE FORM, A SECOND UNIDIRECTIONAL CURRENT MEANS CONNECTING SAID OUTPUT TO THE BASE OF SAID TRANSISTOR AND PROVIDING POSITIVE PULSES THERETO, AND A BLOCKING MEANS COMPRISING A DIODE AND A CURRENT LIMITING RESISTOR SERIALLY CONNECTING SAID OUTPUT TO SAID SOURCE, SAID BLOCKING MEANS PROVIDING A PULSATING VOLTAGE TO BLOCK ANY PHASE SHIFTER OUTPUT WHICH WOULD OTHERWISE OCCUR DURING NONCONDUCTIVE HALF-CYCLES OF ANODIZATION OF SAID CONTROLLED RECTIFIER.
Claim 2
Independent Claim
150 words
AN APPARATUS FOR CONTROLLING THE INITIATION OF FIRING PULSES TO THE GATE OF A CONTROLLED RECTIFIER ENERGIZED FROM AN ALTERNATING CURRENT SOURCE, COMPRISING AT LEAST ONE TRANSISTOR HAVING ITS EMITTER-COLLECTOR CIRCUIT IN CONNECTION TO SAID GATE, A FIRST UNIDIRECTIONAL CURRENT MEANS CONNECTING SAID TRANSISTOR TO SAID SOURCE AND PROVIDING A PULSATING FORWARD EMITTER-COLLECTOR BIAS THEREON, A VARIABLE PHASE SHIFTING MEANS COUPLED TO SAID SOURCE, SAID PHASE SHIFTING MEANS PROVIDING AT THE OUTPUT THEREOF AN ALTERNATING CURRENT OF VARIABLE PHASE ANGLE AND A SUBSTANTIALLY SINUSODIAL WAVE FORM, A SECOND UNIDIRECTIONAL CURRENT MEANS CONNECTING SAID OUTPUT TO THE BASE OF SAID TRANSISTOR AND PROVIDING POSITIVE PULSES THERETO, AND A BLOCKING MEANS COMPRISING A DIODE AND A CURRENT LIMITING RESISTOR SERIALLY CONNECTING SAID OUTPUT TO SAID SOURCE, SAID BLOCKING MEANS PROVIDING A PULSATING VOLTAGE TO BLOCK ANY PHASE SHIFTER OUTPUT WHICH WOULD OTHERWISE OCCUR DURING NONCONDUCTIVE HALF-CYCLES OF ANODIZATION OF SAID CONTROLLED RECTIFIER.
References Cited (Backward Citations)
US2977523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |