Stamm [45] Oct. 5, 1982 [54] BAITERY OPERATED ACCESS CONTROL 3,944,976 3/1976 France ............................ .. 340/ l46.2 CARD 4,079,356 3/1978 Anagnost et al. ............ .. 340/ l49 A
3,637,994 1/ 1972 Ellingboe 340/258 B
3,839,709 l0/1974 Sugiura 235/61.12 N
3,848,229 ll/1974 Perron et al. .. 340/149 A
3,891,980 6/ 1975 Lewis et al. .. 340/258 D
3,934,l22 l/l976 Riccitelli ...................... .. 235/6l.7 B
Primary Examiner—Harold I. Pitts
Attorney, Agent, or Firm——Trevor B. Joike
An access control card for use in an access control system. A battery, a wireless signal sensor such as an antenna for receiving coded wireless signals such as coded radio frequency signals generated by a card reader, a clock connected to the battery and including a receiver are connected to the antenna for supplying a received signal based upon the coded radio frequency signal. A memory for stores first and second stored codes, and a transmit circuit connected to the antenna, to the clock and to the memory compares the first stored code to the received signal and transmits the second stored code when there is a match between the received signal and the first stored code.
. , . /i .- \...~ .. .~...__ .._~ -n 1
