Transmission and reception system for controlling locking/unlock

Details Transmission and reception system for controlling locking/unlock Transmission and reception system for controlling locking/unlock

1997-03-11

1999-08-17

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

34082554, 34082569, 34082572, 340636, 455343, 361172, H04Q 900

Patent

active

059400013

ABSTRACT:
A transmission and reception system for controlling a locking/unlocking operation of a key includes a transmission section for transmitting a control signal having a predetermined frequency for effecting locking/unlocking of the key, and a reception section for receiving the control signal and effecting driving control of the key in response to the control signal. The reception section includes a carrier detection circuit for detecting a frequency of the control signal and supplies power only to the carrier detection circuit when the control signal is not received.

REFERENCES:
patent: 4700186 (1987-10-01), Fujino et al.
patent: 4761644 (1988-08-01), Kawai et al.
patent: 4779090 (1988-10-01), Micznik et al.
patent: 4835531 (1989-05-01), Sato
patent: 4881148 (1989-11-01), Lambropoulos et al.
patent: 5541585 (1996-07-01), Duhame et al.
Patent Abstracts of Japan No. JP 03-094309 (Kurahashi).

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