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:
Sep. 14, 1976
Filed:
Jul. 29, 1974
Akio Tanaka, Evanston, IL (US);
Zenith Radio Corporation, Chicago, IL (US);
Abstract
A signal recognizing television tuning system employing a varactor tuner controlled by a ramp voltage source. A counter sequentially supplies channel number information for changing the ramp voltage until the tuner is tuned to receive only signals falling within a restricted frequency range corresponding to the selected channel number. Signal recognition means stop further advance of the counter upon recognition of a television signal. If no television signal is recognized, the counter is advanced and generates a next sequential channel number. An illegal channel number detector causes the counter to automatically advance to the next channel number whenever a non FCC allocated channel number appears.