Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-06-27
1991-06-25
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
34082572, 343894, G08B 1314
Patent
active
050271075
ABSTRACT:
A small-sized thin frequency sensor developed for prevention of theft of an article. The frequency sensor comprises a receiving antenna portion to receive high frequency waves, and a transmitting antenna portion which is shaped into a closed loop with a diode incorporated therein and is disposed linearly to the receiving antenna portion to form an oblong rectangular contour as a whole.
REFERENCES:
patent: 4783646 (1988-11-01), Matsuzaki
patent: 4853703 (1989-08-01), Murakami et al.
Kamei Hiroyuki
Matsuno Yasuhiro
Mochizuki Masaru
Moroshima Heiji
Terakado Hajime
Hitachi , Ltd.
Hitachi Tokyo Electronics Co. Ltd.
Mullen Jr. Thomas J.
Swann III Glen R.
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