Patent US3225209A successfully refreshed from Google Patents.
US3225209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-level d.c./a.c. power converter or amplitude modulator
Assignee: Collins Radio Co
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Filing: 1962-12-17
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Granted: 1965-12-21
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Expires: 1982-12-17
Abstract
No abstract record available.
Inventors
- 👤 Donald H Schuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:46
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/538; H02M7/5381; H02M7/53803; H02M7/53806; H03; H03C; H03C1/00; H03C1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
A D.C. TO A.C. POWER CONVERTER COMPRISING A FIRST TRANSFORMER HAVING A PRIMARY AND A SECONDARY, A CONTROL SIGNAL SUPPLIED TO THE PRIMARY OF THE FIRST TRANSFORMER, A FIRST PAIR OF TRANSISTORS CONNECTED TO OPPOSITE ENDS OF THE SECONDARY OF THE FIRST TRANSFORMER, A SECOND TRANSFORMER HAVING A FIRST PRIMARY WINDING CONNECTED ACROSS THE OUTPUTS OF THE FIRST TRANSISTORS, A PAIR OF ZENER DIODES, A SECOND PAIR OF TRANSISTORS CONNECTED IN SERIES WITH THE ZENER FORMER WITH OPPOSITE ENDS CONNECTED TO THE OUTPUTS OF THE FORMER WITH OPPOSITE ENDS CONNECTED TO THE OUTPUTS OF THE SECOND PAIR OF TRANSISTORS, THE OPPOSITE ENDS OF THE SECONDARY OF THE FIRST TRANSFORMER CONNECTED TO THE ZENER DIODES, AND AN OUTPUT WINDING CONNECTED TO THE SECOND TRANSFORMER AND SUPPLYING AN OUTPUT SIGNAL.
Claim 2
Dependent Claim
128 words
A D.C. TO A.C. POWER CONVERTER COMPRISING A FIRST TRANSFORMER HAVING A PRIMARY AND A SECONDARY, A CONTROL SIGNAL SUPPLIED TO THE PRIMARY OF THE FIRST TRANSFORMER, A FIRST PAIR OF TRANSISTORS CONNECTED TO OPPOSITE ENDS OF THE SECONDARY OF THE FIRST TRANSFORMER, A SECOND TRANSFORMER HAVING A FIRST PRIMARY WINDING CONNECTED ACROSS THE OUTPUTS OF THE FIRST TRANSISTORS, A PAIR OF ZENER DIODES, A SECOND PAIR OF TRANSISTORS CONNECTED IN SERIES WITH THE ZENER FORMER WITH OPPOSITE ENDS CONNECTED TO THE OUTPUTS OF THE FORMER WITH OPPOSITE ENDS CONNECTED TO THE OUTPUTS OF THE SECOND PAIR OF TRANSISTORS, THE OPPOSITE ENDS OF THE SECONDARY OF THE FIRST TRANSFORMER CONNECTED TO THE ZENER DIODES, AND AN OUTPUT WINDING CONNECTED TO THE SECOND TRANSFORMER AND SUPPLYING AN OUTPUT SIGNAL.
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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |