US3170107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controlled frequency alternating current system
Assignee: Westinghouse Electric Corp
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Filing: 1960-05-02
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Granted: 1965-02-16
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Expires: 1980-05-02
Abstract
No abstract record available.
Inventors
- 👤 Ralph D Jessee
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
94 words
A FREQUENCY CONVERTER FOR CONVERTING POLYPHASE ALTERNATING CURRENT OF ONE FREQUENCY TO ALTERNATING CURRENT OIF A DIFFERENT FREQUENCY, SAID CONVERTER COMPRISING BILATERALLY CONDUCTIVE SEMICONDUCTOR SWITCHING MEANS FOR CONNECTING A PLURALITY OF POLYPHASE INPUT LEADS TO A PLURALITY OF OUTPUT LEADS, SAID SWITCHING MEANS BEING ADAPTED TO CONNECT EACH OUTPUT LEAD TO EACH INPUT LEAD IN SUCCESSION IN A PREDETERMINED SEQUENCE TO PROVIDE AN OUTPUT FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN THE INPUT FREQUENCY AND THE FREQUENCY OF OPERATION OF THE SWITCHING MEANS, AND MEANS FOR CONTROLLING THE FREQUENCY OF OPERATION OF THE SWITCHING MEANS.
Claim 2
Dependent Claim
94 words
A FREQUENCY CONVERTER FOR CONVERTING POLYPHASE ALTERNATING CURRENT OF ONE FREQUENCY TO ALTERNATING CURRENT OIF A DIFFERENT FREQUENCY, SAID CONVERTER COMPRISING BILATERALLY CONDUCTIVE SEMICONDUCTOR SWITCHING MEANS FOR CONNECTING A PLURALITY OF POLYPHASE INPUT LEADS TO A PLURALITY OF OUTPUT LEADS, SAID SWITCHING MEANS BEING ADAPTED TO CONNECT EACH OUTPUT LEAD TO EACH INPUT LEAD IN SUCCESSION IN A PREDETERMINED SEQUENCE TO PROVIDE AN OUTPUT FREQUENCY EQUAL TO THE DIFFERENCE BETWEEN THE INPUT FREQUENCY AND THE FREQUENCY OF OPERATION OF THE SWITCHING MEANS, AND MEANS FOR CONTROLLING THE FREQUENCY OF OPERATION OF THE SWITCHING MEANS.
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) | 1968-02-16 | 1968-08-17 | 1969-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-16 | 1972-08-17 | 1973-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-16 | 1976-08-17 | 1977-02-16 | $7700.00 | Window Closed / Lapsed |