Patent US4806930A successfully refreshed from Google Patents.
US4806930A
Expired / Lapsed
US
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Radio control transmitter which suppresses harmonic radiation
Assignee: The Chamberlain Group LLC
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Filing: 1988-05-02
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Granted: 1989-02-21
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Expires: 2008-05-02
Abstract
Abstract A radio control transmitter which suppressed harmonics includes an oscillator which is coded by code selecting switches and in which undesired harmonics are reduced from the output of the transmitter by adding inductors into the emitter, the collector or the base of the radio frequency oscillator.
Inventors
- 👤 Bernard J. Wojciak, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:14
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/00174; G07C9/00182; H; H04; H04B; H04B1/00; H04B1/02; H04B1/04; H04B1/0475
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
116 words
A coded radio frequency transmitter for remote control comprising, a transmit switch, an encoder connected to said transmit switch, code selector switches connected to said encoder, a radio frequency oscillator which oscillates at the desired radiation frequency connected to the output of said encoder and including a transistor amplifier and a first inductor connected in the emitter, collector or base circuit of said transistor so as to produce a high impedance to harmonics of said desired radiation frequency, wherein said first inductor is in the emitter circuit of said transistor amplifier, and including a second inductor which causes a high impedance to harmonics of said desired radiation frequency connected in the base circuit of said transistor.
Claim 2
Dependent Claim
116 words
A coded radio frequency transmitter for remote control comprising, a transmit switch, an encoder connected to said transmit switch, code selector switches connected to said encoder, a radio frequency oscillator which oscillates at the desired radiation frequency connected to the output of said encoder and including a transistor amplifier and a first inductor connected in the emitter, collector or base circuit of said transistor so as to produce a high impedance to harmonics of said desired radiation frequency, wherein said first inductor is in the emitter circuit of said transistor amplifier, and including a second inductor which causes a high impedance to harmonics of said desired radiation frequency connected in the base circuit of said transistor.
Claim 3
Dependent Claim
31 words
A coded transmitter according to claim 1 including a third inductor which causes a high impedance to harmonics of said desired radiation frequency connected in the collector circuit of said transistor.
Claim 4
Dependent Claim
115 words
A coded radio frequency transmitter for remote control comprising, a transmit switch, an encoder connected to said transmit switch, code selector switches connected to said encoder, a radio frequency oscillator which oscillates at the desired radiation frequency connected to the output of said encoder and including a transistor amplifier and a first inductor connected in the emitter, collector or base circuit of said transistor so as to produce a high impedance to harmonics of said desired radiation frequency, wherein said first inductor is in the emitter circuit of said transistor amplifier, and a second inductor which causes a high impedance to harmonics of said desired radiation frequency connected in the collector circuit of said transistor.
Claim 5
Dependent Claim
115 words
A coded radio frequency transmitter for remote control comprising, a transmit switch, an encoder connected to said transmit switch, code selector switches connected to said encoder, a radio frequency oscillator which oscillates at the desired radiation frequency connected to the output of said encoder and including a transistor amplifier and a first inductor connected in the emitter, collector or base circuit of said transistor so as to produce a high impedance to harmonics of said desired radiation frequency, wherein said first inductor is in the emitter circuit of said transistor amplifier, and a second inductor which causes a high impedance to harmonics of said desired radiation frequency connected in the collector circuit of said transistor.
Claim 6
Dependent Claim
29 words
A coded transmitter according to claim 3 including a third inductor which causes a high impedance harmonics of said desired radiation connected in the collector circuit of said transistor.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |