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Trademarks = 8

Forward Citations = 105

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7 inventors (with patents filed for the assignee):

Clifford C Hach (8 out of 13 patents)

Michael D Buck (2 out of 3 patents)

Paul E Larson (2 out of 2 patents)

4. Wayne P Zemke (1 out of 2 patents)

5. Sharon S Sloat (1 out of 1 patent)

6. M Leland Andersen (1 out of 1 patent)

7. David J Schoonover (1 out of 2 patents)

12 patents: Sort by Forward Citations

1. 4329149 - Method for spectrophotometric compensation for colorimetric reagent (1982-05-11),

2. 4288308 - Continuous pH meter (1981-09-08),

3. 4249069 - Flask heater assembly (1981-02-03),

4. 4220921 - Conductivity probe for viscous liquids (1980-09-02),

5. 4205955 - Calcium and magnesium specific hardness method using aluminum chelate (1980-06-03),

6. 4198161 - Low turbidity nephelometer (1980-04-15),

7. 4197746 - Slurry pipet (1980-04-15),

8. 4177148 - Mechanical strainer (1979-12-04),

9. 4086062 - Digital titration device (1978-04-25),

10. 4053282 - Method and apparatus for sampling impure water (1977-10-11),

11. 4025309 - Carbon nitrogen test system (1977-05-24),

12. 3953136 - Method and apparatus for automatically analyzing fluids (1976-04-27),

Hach Chemical Company is a global leader in water analysis and supply chain management solutions. With over 80 years of experience, they provide innovative products, services, and expertise to help customers ensure the quality and safety of water resources. Their comprehensive range of products includes reagents, test kits, instruments, and software for water testing and analysis.

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USPTO Data Jan 1 1976 - Dec 16 2025

12 Patents

#11 in Ames, IA

#152 in Iowa

#24,788 in US

#46,685 in the World

Ames, IA, United States of America

Hach Chemical Company