DS

David J. Schoonover

HA Hach: 1 patents #109 of 214Top 55%
HC Hach Chemical: 1 patents #4 of 7Top 60%
Overall (All Time): #2,355,659 of 4,157,543Top 60%
2
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
4557899 Water-in-oil testing apparatus Tillman Frazier Taylor 1985-12-10
4329149 Method for spectrophotometric compensation for colorimetric reagent variation Paul E. Larson 1982-05-11