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:
Nov. 10, 1992
Filed:
Jan. 11, 1991
Applicant:
Inventor:
Mark L Rentz, Torrance, CA (US);
Assignee:
Cartesian Devices, Claremont, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01S / ;
U.S. Cl.
CPC ...
364460 ; 364452 ; 342451 ;
Abstract
The present invention is an improved position tracking system utilizing at least three cw transmitting stations generally symmetrically disposed about an area of interest, and also including a mobile receiving station receiving the transmitted signals, converting the received signals to a common frequency, and comparing the phase difference between the converted signals to produce and output signal indicating the location of the mobile station relative to any desired point or points in the area of interest.