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For the Inventor, By the Inventor

Rothschild, WI, United States of America

Zimpro Passavant Environmental Systems, Inc.


USPTO Granted Patents = 12

Forward Citations = 389

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18 inventors (with patents filed for the assignee):

goldMedal Richard W Lehmann (3 out of 11 patents)

silverMedal Bruce L Brandenburg (2 out of 12 patents)

bronzeMedal William M Copa (2 out of 7 patents)

4.  David A Beula (2 out of 3 patents)

5.  Russell G Forbess (1 out of 3 patents)

6.  David S Ross (1 out of 6 patents)

7.  Glover C McIntyre (1 out of 3 patents)

8.  Robert J Kamke (1 out of 1 patent)

9.  Gene W Mueller (1 out of 2 patents)

10.  Robert J Lacombe (1 out of 1 patent)

11.  Kent T Depuydt (1 out of 1 patent)

12.  Joseph S Tikalsky (1 out of 1 patent)

13.  Ronald L Edwards (1 out of 2 patents)

14.  Thomas L Baumann (1 out of 1 patent)

15.  Joseph A Momont (1 out of 5 patents)


12 patents:

1. 5262060 - Wet oxidation of ammonium salt containing liquors (1993-11-16),
2. 5240619 - Two-stage subcritical-supercritical wet oxidation (1993-08-31),
3. 5230810 - Corrosion control for wet oxidation systems (1993-07-27),
4. 5192442 - Multiple zone batch treatment process (1993-03-09),
5. 5183577 - Process for treatment of wastewater containing inorganic ammonium salts (1993-02-02),
6. 5089147 - Underdrain for granular medium filter (1992-02-18),
7. 5084163 - Automatically controlled splash plate (1992-01-28),
8. 5082571 - Caustic sulfide wet oxidation process (1992-01-21),
9. 5075015 - Method for color removal from thermally conditioned sludge liquors (1991-12-24),
10. 5057231 - Method for starting up and controlling operating temperature of a wet (1991-10-15),
11. 5018458 - Furnace combustion zone temperature control method (1991-05-28),
12. 5011114 - Control valve with displacement-compensating seal (1991-04-30),
Company Overview
Zimpro Passavant Environmental Systems, Inc. specializes in advanced environmental technologies, focusing on water and wastewater treatment solutions. The company is known for its innovative approaches to managing and treating industrial and municipal water resources, ensuring compliance with environmental regulations. With a strong emphasis on sustainability, Zimpro develops systems that enhance water quality while minimizing ecological impact, serving clients primarily in North America and beyond.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

12 Patents

#3 in Rothschild, WI

#575 in Wisconsin

#25,540 in US

#48,129 in the World

Rothschild, WI (US)
Rothschild, WI, United States of America

Zimpro Passavant Environmental Systems, Inc.

Forward Citations = 389

18 inventors:

goldMedal Richard W Lehmann (3 out of 11 patents)

silverMedal Bruce L Brandenburg (2 out of 12 patents)

bronzeMedal William M Copa (2 out of 7 patents)

4.  David A Beula (2 out of 3 patents)

5.  Russell G Forbess (1 out of 3 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Zimpro Passavant Environmental Systems, Inc.. Retrieved from https://idiyas.com/company/zimpro-passavant-environmental-systems

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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