Communications: electrical – Continuously variable indicating – With meter reading
Patent
1989-03-03
1991-04-16
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
119 5102, H04B 500, A01K 500
Patent
active
050086600
ABSTRACT:
An electromagnetic detection system comprises a transmitter-receiver apparatus coupled to at least one antenna element to form an electromagnetic interrogation field in an interrogation zone defined at least in part by physical means. A plurality of responders is capable of generating a detectable signal under the influence of an interrogation field. According to the invention, at least one antenna element is a suitably formed structural element forming part of the physical means.
REFERENCES:
patent: 3541995 (1970-11-01), Fathauer
patent: 3790945 (1974-02-01), Fearon
patent: 4068211 (1978-01-01), Van Tol
patent: 4095214 (1978-06-01), Minasy
patent: 4274083 (1981-06-01), Tomoeda
patent: 4384281 (1983-05-01), Cooper
patent: 4617876 (1986-10-01), Hayes
patent: 4655170 (1987-04-01), DaSilva
patent: 4798175 (1989-02-01), Townsend et al.
Wescon Technical Papers, No. 18, 1974, pp. 1-7; J. P. Hanton: "Electronic Means of Livestock Identification" *p. 3, right-hand column, laser section; FIG. 1.
Magistre Dervis
N.V. Nederlandsche Apparatenfabriek Nedap
Yusko Donald J.
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