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:
Oct. 29, 1985
Filed:
Aug. 03, 1982
Applicant:
Inventor:
Akihiko Naito, Tokyo, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H04K / ;
U.S. Cl.
CPC ...
358114 ; 358 86 ; 358122 ;
Abstract
In a cable television system of the type wherein a cable television signal including free and restricted television channels is subjected to selective frequency conversion at individual terminal units to obtain a desired one of the channels for observation, a signal detector is provided for detecting the presence or absence of a polling signal from the central facility and the frequency converter is either disabled or adjusted for reception of a free channel if no polling signal is received.