Gene A Frick

US Patent:

48242420, Apr 25, 1989

Filed:

Sep 26, 1986

Appl. No.:

6/912993

Inventors:

Gene Frick - Anaheim CA
Rex McCarthy - Whittier CA

Assignee:

Sensormedics Corporation - Anaheim CA

International Classification:

G01N 3349
G01N 2135

US Classification:

356 41

Abstract:

The present invention relates to an oximeter for monitoring oxygen saturation of arterial blood. Light of two wavelengths is transmitted through a specimen. Detectors measure the attenuation of light through the specimen to produce two modulating data streams. The data streams are thereafter processed, evaluated, and compared to determine oxygen saturation. A novel method to process, evaluate and compare the two data streams is disclosed.

US Patent:

41676653, Sep 11, 1979

Filed:

Oct 31, 1977

Appl. No.:

5/847408

Inventors:

Robert K. Johns - West Covina CA
Owen M. Houston - Simi Valley CA
Gene Frick - Los Angeles CA

Assignee:

Dasibi Environmental Corporation - Glendale CA

International Classification:

G01J 132
G01N 2126
G05D 2502

US Classification:

250205

Abstract:

A device for measuring the concentration of a radiation-absorbing agent in a gas mixture features circuitry for automatically calibrating the device according to a reference gas mixture. An error detector compares the transmittivity of the reference gas mixture, as determined by a photometer, to a reference current determined by Beer's Law. The error signal thus generated is provided to a sample and hold circuit which includes a digital counting circuit and a digital-to-analog converter. The output of the sample and hold circuit causes the drive current supplied to the radiation source of the photometer to be adjusted to automatically calibrate the device.

US Patent:

48675717, Sep 19, 1989

Filed:

Feb 28, 1989

Appl. No.:

7/317097

Inventors:

Gene Frick - Anaheim CA
Rex McCarthy - Whittier CA
Michael Pawlowski - Chino CA

Assignee:

Sensormedics Corporation - Anaheim CA

International Classification:

G01N 2100
G01N 3349

US Classification:

356436

Abstract:

A device and method for determining pulses in a modulated signal is disclosed. The modulated signal is processed and converted into a quantized analog type of digital data stream. The data stream is evaluated over time by considering preceeding and subsequent values in the data stream to generate a filtered wave form. By using extreme values in the filtered wave form pulse detection is accurately determined regardless of whether the modulated signal has complicating features, such as dicrotic notch, or high noise levels, or both.