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. 12, 2002
Filed:
Nov. 08, 1999
Johan Dawid Kruger, Witkoppen, ZA;
Christopher Gordon Gervase Turner, Halfway House, ZA;
Supersensor (Proprietary) Limited, Goodwood, ZA;
Abstract
An electronic identification system comprises an interrogator and a plurality of transponders and . The interrogator comprises a transmitter for transmitting an interrogation signal to the transponders; a receiver for receiving response signals from the transponders; and a controller for processing response signals received, to identify the transponders by their respective response signals. Each transponder comprises a signature generator for generating a unique signature characteristic of the transponder and intermittently transmits, in responses to the interrogation signal, a response signal including the signature. The interrogator further comprises an acknowledgement signal generator for generating upon reception of a response signal from one of the transponders, an acknowledgement signal to be transmitted by the transmitter . The acknowledgement signal comprises the signature, thereby to acknowledge reception of the response signal.