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. 15, 1994
Filed:
Sep. 07, 1993
Applicant:
Inventors:
John F Kennedy, Dearborn, MI (US);
Lawrence P Kirk, Canton, MI (US);
Gregory A Marek, Livonia, MI (US);
Assignee:
Ford Motor Company, Dearborn, MI (US);
Primary Examiner:
Int. Cl.
CPC ...
G01S / ; H04B / ;
U.S. Cl.
CPC ...
342 44 ; 34082554 ; 342175 ; 455 78 ;
Abstract
A method and apparatus for interrogating a transponder using a single transmitter-receiver antenna transmits an interrogation signal to the transponder. The transmit signal has two segments; a first segment for energizing the transmitter-receiver antenna and a second segment having a second phase for cancelling energy in the transmitter-receiver antenna. The amount of energy is reduced before the transponder transmits a response signal.