Douglas E Furney Deceased10484 W Arkansas Dr, Lakewood, CO 80232

4290055, Sep 15, 1981

Dec 5, 1979

6/100574

Douglas E. Furney - Lakewood CO
Michael J. Muldrey - Lakewood CO

Technical Development LTD - Hamilton

G08B 1900

340518

A scanning control system is disclosed for remotely sensing or monitoring a predetermined condition or state, such as the presence of a fire, by means of one or a multiplicity of detecting stations at one or a multiplicity of locations with each detecting station providing a positive indication of the location of each predetermined condition sensed. A scanning or control panel is electrically connected with the detecting stations by means of four wires extending from the panel regardless of the number of detecting stations utilized in the system. Two of the four wires are power and return leads from the scanning panel to all of the detecting stations, a third wire provides an interrogation pulse with the first detecting station receiving an interrogation pulse from the scanning panel and each succeeding detector station receiving an interrogation pulse generated by the preceding detector station at a predetermined later time following receipt of the interrogation pulse from the preceding detector station, and the fourth wire carries a pulse train of timewise spaced data pulses generated by the detecting stations in response to receipt of an interrogation pulse. Each data pulse generated by each detecting station is controlled as to pulse width so as to be indicative of the presence or absence of the condition being monitored, such as the presence or absence of a fire. The data pulses are processed at the scanning panel and an alarm generated if the pulses are indicative of a sensed condition such as a fire.

4167687, Sep 11, 1979

Feb 10, 1977

5/767582

Douglas E. Furney - Golden CO

Unitec, Inc. - Englewood CO

G01N 2312

313 54

A smoke detection apparatus is disclosed having a highly efficient ionization chamber. The ionization chamber is primarily formed by a wire mesh collector that readily admits products of combustion such as smoke into the chamber which has therein an alpha emitting, radioactive source and a selectable portion of a tuning screw. Two types of smoke detectors are shown utilizing the ionization chamber with one of the detectors operating from a conventional A. C. power source and the other being battery operated. The smoke detector utilizing the conventional A. C. power source requires no transformer and has the alarm indicating horn connected with the A. C. source with the horn being triggered by a silicon controlled rectifier connected with the radioactive source in the ionization chamber through a field effect transistor switch. A rectified and regulated D. C. voltage is provided to the wire mesh collector and to the field effect transistor switch.