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. 16, 1977
Filed:
Feb. 13, 1976
Carl E Atkins, Montclair, NJ (US);
Wagner Electric Corporation, Parsippany, NJ (US);
Abstract
A keyable control circuit generates a narrow-band FM signal. A keying circuit, containing two tuned circuits, placed next to the tank coil of the keyable control circuit, absorbs rf energy each time the FM signal sweeps past the resonant frequency of one of the tuned circuits. Detector circuits within the keyable control circuit, upon sensing the amplitude modulation imposed by the cyclic absorption by one of the tuned circuits, cause the rf frequency of the FM signal to jump to a second frequency region. If the second tuned circuit in the keying circuit matches the new frequency, detector circuits again detect the amplitude modulation imposed by the cyclic absorption. After detecting the second signal, the keyable control circuit generates an electrical control signal output for use by external circuits.