Patent US3129393A successfully refreshed from Google Patents.
US3129393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balun transformer with variable transformation ratio
Assignee: Individual
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Filing: 1961-03-30
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Granted: 1964-04-14
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Expires: 1981-03-30
Abstract
No abstract record available.
Inventors
- 👤 James T Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:16
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/42; H03H7/422
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A BALUN TRANSFORMER COMPRISING IN COMBINATION, A PAIR OF COAXIAL LINES OF UNEQUAL LENGTH, A CONDUCTING PLATE CONNECTING THE OUTER CONDUCTORS OF SAID COAXIAL LINE TOGETHER AT A GIVEN DISTANCE FROM ONE END OF EACH COAXIAL LINE, SAID CONDUCTING PLATE BEING GROUNDED AND SHORTCIRCUITING THE INNER AND OUTER CONDUCTORS OF THE SHORTER COAXIAL LINE AT THE OTHER END THEREOF, MEANS CONNECTING THE INNER AND OUTER CONDUCTORS OF THE SHORTER COAXIAL LINE TOGETHER AT SAID ONE END THEREOF, FIRST AND SECOND VARIABLE CAPACITORS, SAID FIRST CAPACITOR BEING CONNECTED BETWEEN THE INNER CONDUCTORS OF SAID COAXIAL LINES AT SAID ONE END THEREOF, SAID SECOND CAPACITOR BEING CONNECTED BETWEEN THE OUTER CONDUCTORS OF SAID COAXIAL LINES AT SAID ONE END THEREOF, MEANS FOR COUPLING A RADIO FREQUENCY SIGNAL ACROSS THE OUTER CONDUCTORS OF SAID COAXIAL LINES AT SAID ONE END THEREOF, THE OUTPUT OF SAID TRANSFORMER BEING TAKEN ACROSS THE INNER AND OUTER CONDUCTORS OF THE LONGER COAXIAL LINE AT THE OTHER END THEREOF.
Claim 2
Dependent Claim
161 words
A BALUN TRANSFORMER COMPRISING IN COMBINATION, A PAIR OF COAXIAL LINES OF UNEQUAL LENGTH, A CONDUCTING PLATE CONNECTING THE OUTER CONDUCTORS OF SAID COAXIAL LINE TOGETHER AT A GIVEN DISTANCE FROM ONE END OF EACH COAXIAL LINE, SAID CONDUCTING PLATE BEING GROUNDED AND SHORTCIRCUITING THE INNER AND OUTER CONDUCTORS OF THE SHORTER COAXIAL LINE AT THE OTHER END THEREOF, MEANS CONNECTING THE INNER AND OUTER CONDUCTORS OF THE SHORTER COAXIAL LINE TOGETHER AT SAID ONE END THEREOF, FIRST AND SECOND VARIABLE CAPACITORS, SAID FIRST CAPACITOR BEING CONNECTED BETWEEN THE INNER CONDUCTORS OF SAID COAXIAL LINES AT SAID ONE END THEREOF, SAID SECOND CAPACITOR BEING CONNECTED BETWEEN THE OUTER CONDUCTORS OF SAID COAXIAL LINES AT SAID ONE END THEREOF, MEANS FOR COUPLING A RADIO FREQUENCY SIGNAL ACROSS THE OUTER CONDUCTORS OF SAID COAXIAL LINES AT SAID ONE END THEREOF, THE OUTPUT OF SAID TRANSFORMER BEING TAKEN ACROSS THE INNER AND OUTER CONDUCTORS OF THE LONGER COAXIAL LINE AT THE OTHER END THEREOF.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |