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:
Aug. 23, 1988
Filed:
May. 06, 1987
Frank G Banach, Oak Lawn, IL (US);
James G Haerle, Streamwood, IL (US);
David S Tait, Wood Dale, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A cable-ready television receiver including a tuner switchable between cable and off-air signals has an LC trap tuned to the audio carrier frequency coupled between the tuner and a SAW IF amplifier. The trap includes a varactor diode that, when it exhibits a large capacitance, effectively disables the trap. This occurs when the receiver is used with cable signals. In the event the receiver is used for off-air signals, the voltage applied to the varactor diode causes it to exhibit a much smaller capacitance which effectively enables the trap.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile