Robert L Corbin Deceased241 Morris Ave, West Covina, CA 91790

5032824, Jul 16, 1991

Nov 4, 1988

7/267333

Robert L. Corbin - Long Beach CA

Pacific Electronic Technology, Inc. - Long Beach CA

G08B 1300

340574

A hand held personal alarm incorporating a high intensity light and loud horn and further incorporating a plurality of switches that are located a distance apart that prevents their actuation by the digits of a single hand or by pressing the alarm against a single surface. The switches provide the only means of deactivating the alarm once activated. An alternative embodiment includes a timing circuit that prevents deactivation of the alarm for a set period after activation. Both schemes prevent easy deactivation of the alarm by an assailant, thereby providing more protection than with conventional hand held alarms.

5129255, Jul 14, 1992

Oct 6, 1989

7/418044

Robert L. Corbin - Long Beach CA

The Aerospace Corporation - El Segundo CA

G01N 2902

73 2402

An electronic system for detecting and tracking the resonant frequency of a photoacoustic cell is described. The system includes and makes use of inherent signal acquisition properties. The detection and tracking circuitry promotes acoustic oscillation at the cell resonant frequency while the amplitude of the acoustic oscillation is automatically controlled at a specific reference level. Under normal operation, a change in system oscillation amplitude with respect to the reference level is considered to be the result of additional acoustic excitation other than that provided by the electronic system. Changes in the oscillation amplitude, as compared to a reference level, produce an error signal which is directly related to the additional acoustic excitation. The system is particularly useful in measuring gaseous phase materials over a wide dynamic range of concentrations.