Patent US4267604A successfully refreshed from Google Patents.
US4267604A
Expired / Lapsed
US
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UHF electronic tuner
Assignee: Sony Corp
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Filing: 1979-01-19
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Granted: 1981-05-12
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Expires: 1999-01-19
Abstract
Abstract An RF input tuning circuit in a UHF electronic tuner uses a semicoaxial resonant cavity circuit which feeds amplifier and other tuning circuits not of the semicoaxial type, such as lumped constant or strip-line types.
Inventors
- 👤 Akira Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:53
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
An ultra high frequency electronic tuner for tuning and heterodyning a desired radio frequency signal from among a possible plurality of radio frequency signals received from an antenna, said tuner comprising: a circuit board, a conductive tuner case surrounding said circuit board, a slender metallic bar mounted on said circuit board and forming a resonant cavity between itself and a wall of said tuner case, said resonant cavity being a resonant cavity radio frequency input circuit, an antenna coil for receiving radio frequency input signals, said antenna coil being disposed in said tuner case and being electromagnetically coupled to said slender metallic bar, at least one other resonant circuit disposed on said circuit board for tuning an output of said resonant cavity and being of a type other than a resonant cavity circuit.
Claim 2
Dependent Claim
133 words
An ultra high frequency electronic tuner for tuning and heterodyning a desired radio frequency signal from among a possible plurality of radio frequency signals received from an antenna, said tuner comprising: a circuit board, a conductive tuner case surrounding said circuit board, a slender metallic bar mounted on said circuit board and forming a resonant cavity between itself and a wall of said tuner case, said resonant cavity being a resonant cavity radio frequency input circuit, an antenna coil for receiving radio frequency input signals, said antenna coil being disposed in said tuner case and being electromagnetically coupled to said slender metallic bar, at least one other resonant circuit disposed on said circuit board for tuning an output of said resonant cavity and being of a type other than a resonant cavity circuit.
Claim 3
Dependent Claim
115 words
An ultra high frequency electronic tuner for tuning and heterodyning a desired radio frequency signal from among a possible plurality of radio frequency signals received from an antenna, said tuner comprising: a circuit board, a conductive tuner case surrounding said circuit board, a slender metallic bar mounted on said circuit board and electromagnetically coupled to said antenna, said metallic bar forming a resonant cavity between itself and a wall of said tuner case, said resonant cavity being a resonant cavity radio frequency input circuit, and at least one other resonant circuit disposed on said circuit board for tuning an output of said resonant cavity and being of a type other than a resonant cavity circuit.
Claim 4
Dependent Claim
115 words
An ultra high frequency electronic tuner for tuning and heterodyning a desired radio frequency signal from among a possible plurality of radio frequency signals received from an antenna, said tuner comprising: a circuit board, a conductive tuner case surrounding said circuit board, a slender metallic bar mounted on said circuit board and electromagnetically coupled to said antenna, said metallic bar forming a resonant cavity between itself and a wall of said tuner case, said resonant cavity being a resonant cavity radio frequency input circuit, and at least one other resonant circuit disposed on said circuit board for tuning an output of said resonant cavity and being of a type other than a resonant cavity circuit.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |