EP 0151087 B1 19910724 - DEVICE FOR TWO-WAY INTERCHANGE OF INFORMATION
Title (en)
DEVICE FOR TWO-WAY INTERCHANGE OF INFORMATION
Publication
Application
Priority
DE 3402737 A 19840127
Abstract (en)
[origin: US4602253A] An apparatus for mutual information transmission between an electronic lock and a key uses antenna coils at both the key and lock. A periodic signal is emitted from the lock and is received by the key upon activation of a key electronics and emission of a coded information signal. This returned signal received from the lock coil is briefly short-circuited or damped at the key side in order to produce a synchronization switch synchronizing the points in time of the signal appearance. Electronic converters are provided which, given the pre-condition that the short-circuit signal extends over a plurality of signal pulses, generate a digital signal corresponding to the short-circuit times.
IPC 1-7
IPC 8 full level
E05B 49/00 (2006.01); G07C 9/00 (2006.01)
CPC (source: EP US)
G07C 9/00309 (2013.01 - EP US); G07C 2009/00777 (2013.01 - EP US)
Designated contracting state (EPC)
AT CH FR GB LI NL SE
DOCDB simple family (publication)
EP 0151087 A2 19850807; EP 0151087 A3 19880601; EP 0151087 B1 19910724; AT E65577 T1 19910815; CA 1217839 A 19870210; DE 3402737 C1 19850801; FI 78535 B 19890428; FI 78535 C 19890810; FI 850166 A0 19850115; FI 850166 L 19850728; US 4602253 A 19860722
DOCDB simple family (application)
EP 85730009 A 19850128; AT 85730009 T 19850128; CA 472841 A 19850125; DE 3402737 A 19840127; FI 850166 A 19850115; US 69534785 A 19850128