Electronic locking device having key and lock parts interacting via electrical pulses
Anti-theft apparatus for vehicles
Radio-controlled lock method with automatic code change
Portable transmitter which conserves transmitter power by storing charges from previous pulses
Keyless entry system for automotive vehicle with power consumption saving feature
Keyless entry system for automotive vehicle devices with weak-battery alarm
Computer controlled deadbolts Patent #: 4744021
ApplicationNo. 07/085075 filed on 08/12/1987
US Classes:340/5.31, Lockout or disable340/5.64, Wireless transmitter340/825.69, Radio link361/172, Including electronic element70/256Remote control
ExaminersPrimary: Griffin, Robert L.
Assistant: Kuntz, Curtis
Attorney, Agent or Firm
International ClassG07C 9/00 (20060101)
Foreign Application Priority Data1986-08-21 DE
AbstractAn electronic locking system and method provides a control unit in a receiver to open a lock of a locking system when a transmission sequence output by a transmitter of the electronic locking system coincides with a reference sequence within a re-synchronization region in the receiver, the transmission sequence being formed by a user by repeated actuation of the transmitter and stored in a mark memory of the receiver. If necessary, the synchronization unit synchronizes the reference generator to the most recent transmission mark of the transmission sequence.
Field of SearchRemote control of a transmitter