The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 02, 1989
Filed:
Sep. 02, 1988
Tohru Izumiyama, Soma, JP;
Alps Electric Co., Ltd., , JP;
Abstract
In a CATV receiver for receiving scrambled television signal, then de-scrambling it to original television signal responsive to key pulses contained in the scrambled television signal, and then outputting it at a predetermined frequency band, said receiver characerized in that an output section of the receiver is provided with a trap circuit for attenuating signals which are at frequency bands adjacent to the predetermined frequency band and that the trap circuit is made operative synchronizing with the key pulses. Even when either of the adjacent channels is selected by the common television set, therefore, the television signal at the adjacent channel cannot be picked up to thereby prevent it from being poachingly viewed on the screen of the television set.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile