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:
Dec. 10, 1991
Filed:
Jun. 26, 1990
Tallienco W Fockens, Eibergen, NL;
N.V. Nederlandsche Apparatenfabriek Nedap, De Groenlo, NL;
Abstract
An electromagnetic identification and location system is described. The system comprises at least one interrogator which, in operation, generates an electromagnetic interrogation field by at least one antenna coil, and at least one responder which, in response to the electromagnetic interrogation field, generates a code signal in accordance with a binary code stored in a code circuit of the responder. The code signal can be recognized by an identifier. According to the invention, the responder is provided with a generator which, in response to the interrogation field, generates and transmits a pilot signal. The system further includes a position-sensitive antenna arrangement for receiving the pilot signal.