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:
Feb. 15, 2000
Filed:
Mar. 06, 1998
Applicant:
Inventors:
Thua Van Ho, Mississauga, CA;
Robert Walter Tiernay, Mississauga, CA;
Assignee:
Mark IV Industries Limited, Mississauga, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01Q / ;
U.S. Cl.
CPC ...
342374 ; 342373 ; 342457 ; 455 20 ;
Abstract
In order to locate a transponder in a roadway there are first and second antenna arrays at spaced locations. Each array is associated with a switching control which causes the array beam to step through a series of beams. The signal developed in each beam is converted to a digital result. The strongest beam from each array may be determined and the location of the transponder at the intersection of the two strongest beams.