Daniel W Schaeffer

US Patent:

43353754, Jun 15, 1982

Filed:

Feb 13, 1978

Appl. No.:

5/877377

Inventors:

Daniel D. Schaeffer - Santa Monica CA

International Classification:

G08B 108
G08B 1308

US Classification:

340539

Abstract:

A container for an alarm transmitter used in combination with components of a transmitter circuitry which includes voltage control for providing a gated voltage and controlled by a timing circuit. The components also include an audio multivibrator which is electrically coupled to the voltage control in order to receive the gated voltage, a microfork audio filter which is electrically coupled to the audio multivibrator and a modulator which is electrically coupled to the audio multivibrator. The components further include a radio frequency oscillator whose frequency is modulated by the modulator and which has an antenna electrically coupled to its output terminal. The container includes a tubular member which is adapted to be installed into a hole in a wall adjacent to a door or a window and an elongated, rectangular member adapted to be inserted into the tubular member and also adapted to have the components of the transmitter circuitry placed thereon. The container also includes a battery, which has one of its lead electrically coupled to the voltage control and electrical-coupling device for electrically coupling the other lead of the battery to the voltage control in order to complete the circuit. The electrical-coupling device includes a reed relay which is held normally open by a magnet which is placed in the adjacent door or window.

US Patent:

D2616289, Nov 3, 1981

Filed:

Aug 16, 1978

Appl. No.:

5/934000

Inventors:

Daniel D. Schaeffer - Santa Monica CA

International Classification:

D1005

US Classification:

D10106