Communications: electrical – Continuously variable indicating – With meter reading
Patent
1993-08-05
1995-11-14
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082531, 34082534, H04Q 900
Patent
active
054670829
ABSTRACT:
An identification token and reader circuit for an electronic identification and latch/alarm system, the token comprising an LC resonant circuit, a digital counter, an analog or digital demultiplexer and at least one analog switch. The token's supply voltage is derived from the token's resonant LC circuit by a rectifier means when the token is proximal to a suitable oscillator as found in a reader/controller. The device is useful for access control in an electronic lock and key system. When the token is brought near to the lock part, an oscillator contained within the lock part oscillates at a high frequency. The oscillation is picked up by the key part where it is modulated with a frequency or pulse pattern serving as a key identifier, then transmitted back to the lock part where the enclosed carrier is demodulated by means of synchronous detection and processed by recognition means at the lock side.
REFERENCES:
patent: 3299424 (1967-01-01), Vinding
patent: 4196418 (1980-04-01), Kip et al.
patent: 4333072 (1982-06-01), Beigel
patent: 4388524 (1983-06-01), Walton
patent: 4510495 (1985-04-01), Sigrimis et al.
patent: 4604253 (1986-07-01), Kreft
Holloway III Edwin C.
Petit Michael G.
Yusko Donald J.
LandOfFree
Proximity actuator and reader for an electronic access system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Proximity actuator and reader for an electronic access system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Proximity actuator and reader for an electronic access system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1223966