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US 4,232,396 AGranted
Television channel lock-out apparatus
OwnerArnold S. Grimesinventor
Life of this patent
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OwnerArnold S. Grimesinventor
Estimating the term…
A television channel lock-out apparatus utilizes a plurality of individual circuits, each comprising at least one impedance element in series with a switch. The individual series of circuits are all disposed in parallel and are connected to a single switch in series therewith, and, if desired, another impedance element. The overall apparatus is disposed in parallel with any portion of a television receiver which carries the individual radio frequency signals for all of the channels handled by the television receiver, or if desired, in parallel with the local oscillator of the receiver. In operation, any one or more individual series circuit switch is closed, and when the master series switch is closed, the impedance elements disposed in electrical relationship with one another either presents a series impedance with the radio frequency signal, or shift the frequency of the local oscillator so as to preclude the receiver operating on one or more selected television channels. The remaining television channels continue to be able to be handled by the receiver by permitting the radio frequency amplifier portions of the receiver and the local oscillator portion of the receiver to function in the usual manner.
A television channel lock-out apparatus comprising a plurality of individual series circuits, each of said plurality of individual series circuits having at least one reactive element in series with an individual switch element, said individual series circuits having one end thereof coupled together, said individual switch element selectively coupling the other end of said individual series circuits together to one end of a parallel electrical circuit, said one end of said individual series circuits coupled to the other end of said parallel circuit, said parallel electrical circuit having said at least one reactive element coupled to one of a plurality of selected portions of a multi-channel television receiver circuit and a ground terminal thereof, said plurality of selected portions including a signal antenna terminal, a radio frequency amplifier terminal, a mixer input terminal and a local oscillator terminal of said receiver circuit, means for enabling said individual series circuits to be independently, selectively and concurrently coupled to said selected portion of said television receiver circuit so that said television receiver has a selected number of the otherwise operable channels which are thereby rendered inoperable.
Dependencies are inferred from the claim text.