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:
Jan. 03, 1978
Filed:
May. 28, 1976
David John Carlson, Indianapolis, IN (US);
RCA Corporation, New York, NY (US);
Abstract
A battery powered ultrasonic remote control transmitter for controlling various functions associated with a television receiver, or the like, includes an arrangement for providing an audible indication that the battery voltage has fallen below a desired operating level. In one embodiment, when the battery voltage has fallen below the desired level, the electrical control signal for at least one control function is selectively amplitude modulated by an audio frequency signal before being coupled to the ultrasonic transducer. As a result, when the control function is selected, an operator is given an audible indication that the battery needs recharging or replacement.