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. 29, 1985
Filed:
Oct. 19, 1983
Applicant:
Inventor:
Helmut Uebel, Leonberg, DE;
Assignee:
International Standard Electric Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ; H04B / ;
U.S. Cl.
CPC ...
455 41 ; 179 82 ; 246 / ; 2461 / ; 2461 / ; 34082554 ; 343 / ; 343 / ;
Abstract
A facility is disclosed comprising an on-board interrogator and a passive trackside transponder which transmits data messages to the interrogator on a single FM channel using, for instance, frequency shift techniques and draws the necessary transmitting energy from an alternating magnetic field produced by the interrogator. The antenna of the interrogator and the transponder are ferrite-rod antennas which are enclosed in housings similar to that used in inductive signalling equipment. The magnetic interaction between the active portion and the passive portion of the facility is used to locate faulty passive transponders.