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:
Mar. 06, 2001
Filed:
Sep. 25, 1998
Christopher Gordon Gervase Turner, Gauteng, ZA;
Johan Dawid Kruger, Gauteng, ZA;
Data Investments Limited, Tortola, VG;
Abstract
There is disclosed and claimed an electronic identification system including at east one reader and a plurality of transponders to be read by the reader. Each transponder has a normal operational mode,wherein it, in response to an interrogation signal from the reader transmits a code,to the reader, and a monitor mode,wherein it is still sensitive and responsive to signals from the reader, but wherein it does not transmit the code. The reader is adapted to cause a transponder of which the code has been read, to switch from the normal operational mode to the monitor mode, by transmitting a first signal S,to the transponder. The transponder, while being in the monitor mode, is sensitive to a second signal S,and responsive upon receipt of the second signal, to reset to the normal operational mode.