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:
Mar. 31, 1987
Filed:
Oct. 04, 1983
C James Corris, Shenandoah, GA (US);
Blaine E Beck, Peachtree City, GA (US);
Cellutron Corporation, Peachtree City, GA (US);
Abstract
In a cordless extension telephone system in which a base station is connected to telephone lines and communicates with a remote station by radio transmission, the base station in response to the presence of a ring signal on the telephone lines repeatedly transmits an eleven bit code at a predetermined bit rate. The remote station upon receiving the eleven bit code at least three times in succession generates an audio signal to indicate the presence of a incoming call. The user at the remote station may actuate a control to an 'on' position or an 'off' position. The remote station responds to the actuation of the control and will repeatedly transmit the eleven bit code plus one additional bit having a state indicating whether the control is actuated to the 'on' state or the 'off' state. The base station in response to receiving the eleven bit code at least three times in succession will enble or disable an isolation circuit in accordance with the twelfth bit of the code. The isolation circuit when enabled, will apply the signal on the telephone lines to the input of the transmitter of the base station and the output of the receiver of the base station to the telephone lines.