US3247444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency converter
Assignee: AT&T Inc
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Filing: 1962-12-19
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Granted: 1966-04-19
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Expires: 1982-12-19
Abstract
No abstract record available.
Inventors
- 👤 Patrick W Clarke
- 👤 Joseph A Pirraglia
- 👤 Rando Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:06
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45; H02M5/4505; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/525; H02M7/527
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A FREQUENCY CONVERTER COMPRISING FIRST AND SECOND CIRCUIT INTERRUPTERS, ENERGY STORAGE MEANS, A SOURCE OF POTENTIAL, A LOAD, A MODULATOR, MEANS FOR SERIALLY CONNECTING SAID SOURCE OF POTENTIAL, SAID FIRST CIRCUIT INTERRUPTER, SAID ENERGY STORAGE MEANS, SAID SECOND CIRCUIT INTERRUPTER, SAID MODULATOR AND SAID LOAD, WHEREBY ENERGY IS TRANSMITTED FROM SAID SOURCE TO SAID ENERGY STORAGE MEANS WHEN SAID FIRST CIRCUIT INTERRUPTER IS CONDUCTIVE AND FROM SAID ENERGY STORAGE MEANS TO SAID MODULATOR WHEN SAID SECOND INTERRUPTER IS CONDUCTIVE, SAID FIRST AND SECOND INTERRUPTERS BEING CONDUCTIVE FOR AT LEAST A PORTION OF ALTERNATE INTERVALS, SAID MODULATOR BEING CONDUCTIVE FOR INTERVALS PROPORTIONAL TO THE DESIRED LOAD FREQUENCY.
Claim 2
Dependent Claim
106 words
A FREQUENCY CONVERTER COMPRISING FIRST AND SECOND CIRCUIT INTERRUPTERS, ENERGY STORAGE MEANS, A SOURCE OF POTENTIAL, A LOAD, A MODULATOR, MEANS FOR SERIALLY CONNECTING SAID SOURCE OF POTENTIAL, SAID FIRST CIRCUIT INTERRUPTER, SAID ENERGY STORAGE MEANS, SAID SECOND CIRCUIT INTERRUPTER, SAID MODULATOR AND SAID LOAD, WHEREBY ENERGY IS TRANSMITTED FROM SAID SOURCE TO SAID ENERGY STORAGE MEANS WHEN SAID FIRST CIRCUIT INTERRUPTER IS CONDUCTIVE AND FROM SAID ENERGY STORAGE MEANS TO SAID MODULATOR WHEN SAID SECOND INTERRUPTER IS CONDUCTIVE, SAID FIRST AND SECOND INTERRUPTERS BEING CONDUCTIVE FOR AT LEAST A PORTION OF ALTERNATE INTERVALS, SAID MODULATOR BEING CONDUCTIVE FOR INTERVALS PROPORTIONAL TO THE DESIRED LOAD FREQUENCY.
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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |