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:
Oct. 21, 1980
Filed:
Mar. 12, 1979
Applicant:
Inventor:
Edward J Groth, Jr, Scottsdale, AZ (US);
Assignee:
Motorola, Inc., , US;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04J / ;
U.S. Cl.
CPC ...
370 24 ; 178 696 ; 370100 ; 375 24 ;
Abstract
A control unit and a remote unit each including a transmitter and receiver with the remote unit transmitter and control unit receiver being synchronized first by means of a variable oscillator in the control unit and connected to the receiver in a closed loop, and the transmitter of the control unit and receiver of the remote unit being synchronized second by sensing errors between a received signal and the operating frequency of the receiver in the remote unit and transmitting the error signal back to the control unit by way of the previously synchronized transmitter/receiver for controlling the frequency of the transmitter in the control unit.