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. 09, 1977
Filed:
Sep. 04, 1975
Applicant:
Inventor:
David James Martin, Leatherhead, EN;
Assignee:
Coal Industry (Patents) Limited, London, EN;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01S / ; G08B / ;
U.S. Cl.
CPC ...
3431 / ; 340 21 ; 340282 ;
Abstract
The position of an object which moves along a fixed path is determined by measuring the phase displacement of two signals received from demodulators connected to an aerial located along the path. A transmitter carried by the objects feeds signals to the demodulators and one of these sends a demodulated signal direct to a comparator while the other sends its signal to the comparator along the aerial.