Capacitance change article removal alarm

Details Capacitance change article removal alarm Capacitance change article removal alarm

1990-08-03

1992-10-27

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

307119, 340506, 340529, 340652, 340666, 361283, 361291, G08B 1314

Patent

active

051593165

ABSTRACT:
An object to be protected is placed on a compressible pad having upper and lower conductive plates, separated by a compressible dielectric. A sensing device is connected to the upper and lower plates to sense a first capacitance when the upper plate is compressed by presence of the object, and a change in capacitance when the object is removed so as to permit the dielectric layer to expand and change the capacitance. There is a time delay circuitry and other circuitry to alleviate the possibility of false alarms.

REFERENCES:
patent: 2062269 (1936-11-01), Knowles
patent: 2064980 (1936-12-01), Kelly
patent: 3230519 (1966-01-01), Metz et al.
patent: 3445835 (1969-05-01), Fudaley
patent: 3824460 (1974-07-01), Gustafson
patent: 4273204 (1981-06-01), Gillen
patent: 4293852 (1981-10-01), Rogers
patent: 4386386 (1983-05-01), Akita
patent: 4581677 (1986-04-01), Hruby eet al.
patent: 4816802 (1989-03-01), Doerksen et al.
patent: 4836033 (1989-06-01), Seitz
patent: 4994793 (1991-02-01), Curtis

Affiliated with

Also associated with

Rating

Capacitance change article removal alarm does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Capacitance change article removal alarm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Capacitance change article removal alarm will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-908063