US3521143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static inverters which sum a plurality of waves
Assignee: National Aeronautics and Space Administration
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Filing: 1962-06-26
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Granted: 1970-07-21
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Expires: 1982-06-26
Abstract
No abstract record available.
Inventors
- 👤 Dorrance L Anderson
- 👤 Albert E Willis
- 👤 Carl E Winkler
- 👤 John M Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:39
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/538; H02M7/5381
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A STATIC INVERTER COMPRISING: (A) PULSE GENERATING MEANS FOR GENERATING A WAVE TRAIN OF ELECTRICAL PULSES AT A FIRST FREQUENCY; (B) A SEQUENTIAL PULSE TRAIN GENERATOR RESPONSIVE TO SAID GENERATING MEANS FOR PROVIDING A PLURALITY, N, OF PULSE WAVE TRAINS DIFFEREIN IN TIME BY A FACTOR OF 180*/N WITH THE TIME REFERENCE BEING AT A SECOND FREQUENCY, THE OUTPUT FREQUENCY OF THE INVERTER; (C) N OUTPUT VOLTAGE CODING MEANS, (1) EACH OF SAID CODING MEANS BEING RESPONSIVE TO SEPARATE AND SINGLE PULSE WAVE TRAINS FROM SAID PULSE TRAIN GENERATOR AND AN INPUT DIRECT CURRENT SUPPLY VOLTAGE FOR DEVELOPING AN ALTERNATING CURRENT RECTANGULAR WAVE VOLTAGE FOR EACH PHASE OF THE OUTPUT OF SAID INVERTER AND HAVING A DURATION CORRESPONDING TO PULSES OF SAID PULSE WAVE TRAIN OF SAID PULSE WAVE TRAIN GENERATOR,
Claim 2
Dependent Claim
131 words
A STATIC INVERTER COMPRISING: (A) PULSE GENERATING MEANS FOR GENERATING A WAVE TRAIN OF ELECTRICAL PULSES AT A FIRST FREQUENCY; (B) A SEQUENTIAL PULSE TRAIN GENERATOR RESPONSIVE TO SAID GENERATING MEANS FOR PROVIDING A PLURALITY, N, OF PULSE WAVE TRAINS DIFFEREIN IN TIME BY A FACTOR OF 180*/N WITH THE TIME REFERENCE BEING AT A SECOND FREQUENCY, THE OUTPUT FREQUENCY OF THE INVERTER; (C) N OUTPUT VOLTAGE CODING MEANS, (1) EACH OF SAID CODING MEANS BEING RESPONSIVE TO SEPARATE AND SINGLE PULSE WAVE TRAINS FROM SAID PULSE TRAIN GENERATOR AND AN INPUT DIRECT CURRENT SUPPLY VOLTAGE FOR DEVELOPING AN ALTERNATING CURRENT RECTANGULAR WAVE VOLTAGE FOR EACH PHASE OF THE OUTPUT OF SAID INVERTER AND HAVING A DURATION CORRESPONDING TO PULSES OF SAID PULSE WAVE TRAIN OF SAID PULSE WAVE TRAIN GENERATOR,
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |