US3302093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric frequency changers
Assignee: English Electric Co Ltd
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Filing: 1963-09-16
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Granted: 1967-01-31
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Expires: 1983-09-16
Abstract
No abstract record available.
Inventors
- 👤 Yarrow Christopher John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:33
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/27; H02M5/271
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A FREQUENCY CHANGER FOR PROVIDING AN ALTERNATING CURRENT OUTPUT FROM A POLYPHASE ALTERNATING CURRENT SOURCE COMPRISING, FOR EACH OUTPUT PHASE OF THE FREQUENCY CHANGER, A PAIR OF SERIES-CONNECTED CONTROLLABLE RECTIFIERS FOR EACH PHASE OF THE POLYPHASE SOURCE, MEANS FOR CONNECTING THE CONNECTION POINT BETWEEN EACH PAIR OF CONTROLLABLE RECTIFIERS TO A CORRESPONDING PHASE OF THE ALTERNATING CURRENT SOURCE, MEANS OPERATIVELY ASSOCIATED WITH THE CONTROLLABLE RECTIFIERS FOR CYCLICALLY RENDERING THEM TEMPORARILY CONDUCTIVE IN A PREDETERMINED ORDER AND AT A PREDETERMINED FREQUENCY, INDUCTOR MEANS, MEANS FOR CONNECTING EACH PAIR OF CONTROLLABLE RECTIFIERS IN AN ASSOCIATED BRIDGE CIRCUIT EACH OF WHICH INCLUDES A PAIR OF THE CONTROLLABLE RECTIFIERS IN ADJACENT ARMS OF THE BRIDGE CIRCUIT AND THE INDUCTOR MEANS IN THE OTHER TWO ARMS THEREOF, AND CAPACITOR MEANS CONNECTED IN EACH BRIDGE CIRCUIT BETWEEN THE JUNCTION OF THE PAIR OF CONTROLLABLE RECTIFIERS AND THE JUNCTION OF THE TWO ADJACENT INDUCTIVE ARMS OF THE BRIDGE.
Claim 2
Dependent Claim
151 words
A FREQUENCY CHANGER FOR PROVIDING AN ALTERNATING CURRENT OUTPUT FROM A POLYPHASE ALTERNATING CURRENT SOURCE COMPRISING, FOR EACH OUTPUT PHASE OF THE FREQUENCY CHANGER, A PAIR OF SERIES-CONNECTED CONTROLLABLE RECTIFIERS FOR EACH PHASE OF THE POLYPHASE SOURCE, MEANS FOR CONNECTING THE CONNECTION POINT BETWEEN EACH PAIR OF CONTROLLABLE RECTIFIERS TO A CORRESPONDING PHASE OF THE ALTERNATING CURRENT SOURCE, MEANS OPERATIVELY ASSOCIATED WITH THE CONTROLLABLE RECTIFIERS FOR CYCLICALLY RENDERING THEM TEMPORARILY CONDUCTIVE IN A PREDETERMINED ORDER AND AT A PREDETERMINED FREQUENCY, INDUCTOR MEANS, MEANS FOR CONNECTING EACH PAIR OF CONTROLLABLE RECTIFIERS IN AN ASSOCIATED BRIDGE CIRCUIT EACH OF WHICH INCLUDES A PAIR OF THE CONTROLLABLE RECTIFIERS IN ADJACENT ARMS OF THE BRIDGE CIRCUIT AND THE INDUCTOR MEANS IN THE OTHER TWO ARMS THEREOF, AND CAPACITOR MEANS CONNECTED IN EACH BRIDGE CIRCUIT BETWEEN THE JUNCTION OF THE PAIR OF CONTROLLABLE RECTIFIERS AND THE JUNCTION OF THE TWO ADJACENT INDUCTIVE ARMS OF THE BRIDGE.
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) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |