0299557-A1 is referenced by 12 patents and cites 1 patents.

An identification system, in particular one suitable for stock farms comprising a transmitter/receiver for generating an electromagnetic interrogation field in a detection zone and for receiving an identification signal generated by a responder; and a plurality of coded responders capable of generating an identification signal in response to an electromagnetic interrogation field, each coded responder being, in operation, attached to a specific animal and being capable of generating an identification signal associated with that animal. According to the invention the coded responders have a relatively small area of operation and can be implanted in an animal.; There is further provided for each animal a transponder attachable to such animal, which transponder is, in operation, disposed in the area of operation of the coded responder of the animal, and comprises an electrical circuit which, in response to the interrogation field generated by the transmitter/receiver is capable of generating itself a second interrogation field, which second interrogation field is capable of activating the implantable responder.

Title
Identification system for stock farms.
Application Number
EP19880201358 19880630
Publication Number
0299557 (A1)
Application Date
June 30, 1988
Publication Date
January 18, 1989
Inventor
Hogen Esch Johannes Harm Lukas
Assignee
Nedap
NL
IPC
G01S 13/00
A01K 11/00
H04B 01/59
G08B 13/24
G06K 07/08
G01S 13/00
A61B 05/117
A01K 11/00
H04B 01/59
G08B 13/24
G06K 07/08
G01S 13/78
G01S 13/75
G01S 13/74
A61B 05/117
A01K 11/00
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