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HACH CHEMICAL CO

Overview
  • Total Patents
    48
About

HACH CHEMICAL CO has a total of 48 patent applications. Its first patent ever was published in 1960. It filed its patents most often in United States, Canada and Germany. Its main competitors in its focus markets measurement, machines and chemical engineering are RCC RECH CHIM CLINICA, LISS EBERHARD and B M L KK.

Patent filings in countries

World map showing HACH CHEMICAL COs patent filings in countries
# Country Total Patents
#1 United States 32
#2 Canada 5
#3 Germany 3
#4 France 2
#5 United Kingdom 2
#6 Japan 2
#7 Italy 1
#8 Sweden 1

Patent filings per year

Chart showing HACH CHEMICAL COs patent filings per year from 1900 to 2020

Top inventors

# Name Total Patents
#1 Hach Clifford C 24
#2 Hach C 5
#3 Stookey L 2
#4 Andersen M 2
#5 Pooru Edouin Raason 2
#6 Hach Clifford Charles 2
#7 Larson Paul Edwin 2
#8 Mckaveney James Patrick 1
#9 Buck Michael D 1
#10 Hach Clifford H 1

Latest patents

Publication Filing date Title
US4288308A Continuous pH meter
US4329149A Method for spectrophotometric compensation for colorimetric reagent variation
DE2916388A1 Twin-beam nephelometer with extended range - uses light guide to detect direct and scattered light at higher turbidities
DE2907000A1 NEPHELOMETER
US4249069A Flask heater assembly
US4086062A Digital titration device
US4025309A Carbon nitrogen test system
US4053282A Method and apparatus for sampling impure water
US3953136A Method and apparatus for automatically analyzing fluids
US3849002A Method and apparatus for eliminating air during fluid turbidity measurement
US3905768A Disposable weight burette and method for carrying out titrimetric analyses
US3773423A Automatic analyzer
US3718198A Weight loss spring balance
US3774104A Liquid conductivity measuring apparatus
US3735242A Series voltage regulator wherein an fet supplies a constant current reference voltage to a differential comparator
US3709662A Iron analysis reagent formulation
US3770735A Ferroin reagent and method of making same
US3764646A Method of making comparator color wheels
US3528750A Radiation sensitive dual beam turbidimeter
US3528778A Method for the determination of acid concentrations