Switch device incorporating capacitive oscillator

Details Switch device incorporating capacitive oscillator Switch device incorporating capacitive oscillator

2007-07-03

2007-07-03

Sircus, Brian (Department: 2836)

Electrical transmission or interconnection systems

Switching systems

Condition responsive

C307S116000, C307S125000

Reexamination Certificate

active

10031723

ABSTRACT:
A switch (10) comprises a face plate (16) and a single switch sensing oscillator (18) responsive to a switch activating presence. The oscillator (18) has a resistive component (36) connected to a sensing plate (38) which acts as a first capacitor plate. The face plate (16) is arranged to prevent electrical contact between the user and the oscillator (18). Any object, when placed adjacent the face plate (16), acts as a second capacitor plate which alters the frequency of the oscillator (18). A microprocessor (20) senses the smoke detector (62). In a further aspect the switch includes a mains electricity cable signal transmitter/receiver and a microprocessor whereby each such switch may communicate directly with another such switch.

REFERENCES:
patent: 3555531 (1971-01-01), Montone
patent: 4396011 (1983-08-01), Mack et al.
patent: 5753983 (1998-05-01), Dickie et al.
patent: 5940499 (1999-08-01), Fujii et al.
patent: 6434450 (2002-08-01), Griffin et al.
patent: 6866102 (2005-03-01), Boyce et al.
patent: WO 96/12291 (1996-04-01), None
patent: WO 97/01835 (1997-01-01), None
Rios, Roberto J., Office Action mailed Apr. 8, 2004 in U.S. Appl. No. 10/460,944, Alexandria, Virginia, United States of America.

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