James R Dupree, 71PO Box 321, Provencal, LA 71468

4632562, Dec 30, 1986

Aug 9, 1985

6/764099

James N. Dupree - South El Monte CA
Jack E. Peterson - West Covina CA

Dupree, Inc. - Chino CA

G01N 2100

356436

Apparatus and method for measuring the density of sperm in a sample and for calculating the magnitude of dose required for artificial insemination. An optical assembly with light source, specimen holder and photodetector providing a signal to an amplifier the output of which is proportional to absorbance of the sample. A signal selection system utilizes three parallel signal channels with each having a different correction factor for matching the absorbance signal to actual density count, and including means for selecting the appropriate signal channel as a function of signal amplitude, with the output when calibrated providing the direct reading of the sperm density. Knowing the number of sperm cells desired per insemination and the percent motility of the sample sperm, the required dose is calculated as a function of the density count.

4952107, Aug 28, 1990

Mar 11, 1981

6/242704

James D. Dupree - South El Monte CA

Dupree, Inc. - South El Monte CA

F16B 3704
F16B 3900
F16B 2118

411103

A captive screw assembly for an edge lighted panel assembly of the type used in aircraft cockpits and the like. A screw carried in a resilient washer having a lip for retaining the screw and deflectable fingers for insertion into a panel opening for retaining the washer and screw in the panel. Typically the plate carries switches and other components and the panel is attached to the plate by the screws which engage threaded openings in the plate or in nuts carried by the plate.

4589774, May 20, 1986

Apr 30, 1984

6/605123

James N. Dupree - South El Monte CA
Jack E. Peterson - West Covina CA

Dupree, Inc. - Chino CA

G01N 2100

356436

Apparatus and method for measuring the density of sperm in a sample and for calculating the magnitude of dose required for artificial insemination. An optical assembly with light source, specimen holder and photodetector providing a signal to an amplifier the output of which is proportional to absorbance of the sample. A signal selection system utilizes three parallel signal channels with each having a different correction factor for matching the absorbance signal to actual density count, and including means for selecting the appropriate signal channel as a function of signal amplitude, with the output when calibrated providing the direct reading of the sperm density. Knowing the number of sperm cells desired per insemination and the percent motility of the sample sperm, the required dose is calculated as a function of the density count.

5402240, Mar 28, 1995

Feb 17, 1994

8/197742

Douglas W. Thistlethwaite - Mira Loma CA
Jack E. Peterson - West Covina CA
James N. Dupree - Chino Hills CA

Dupree, Inc. - Chino CA

G01N 2100

356433

An instrument for measuring sperm concentration and calculating dose value and having an optical assembly with a light source, a specimen holder and a photodetector, a computation unit, a display, and a storage unit for storing a concentration calculation equation. The computation unit provides for calculating sperm concentration using the stored concentration calibration equation and a sample transmittance value, the optical assembly provides for measuring transmission of the specimen holder while empty with the light source energized, sample transmission of the specimen holder with a semen specimen with the light source energized, and dark cell output of said photodetector with said light source unenergized, and dark cell output of said photodetector with said light source unenergized, and said computation unit further provides for calculating actual sample percent transmission.