Trademarks = 1

Forward Citations = 271

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10 inventors (with patents filed for the assignee):

William M Copa (4 out of 7 patents)

Thomas J Vollstedt (3 out of 5 patents)

Curtis D Cooley (2 out of 7 patents)

4. David S Ross (2 out of 6 patents)

5. Claude E Ellis (1 out of 4 patents)

6. Bruce L Brandenburg (1 out of 12 patents)

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

8. John A Meidl (1 out of 4 patents)

9. John K Berrigan, Jr (1 out of 3 patents)

10. David A Beula (1 out of 1 patent)

10 patents: Sort by Forward Citations

1. 4983308 - Automatic chemical cleaning of granular medium filters (1991-01-08),

2. 4976873 - Pulsing portions of a filter cell to extend a filter run (1990-12-11),

3. 4952316 - Continuous aeration-batch clarification wastewater treatment (1990-08-28),

4. 4919815 - Two-stage anaerobic/aerobic treatment process (1990-04-24),

5. 4897196 - Two-stage batch wastewater treatment (1990-01-30),

6. 4857198 - Process for treatment of water containing volatile and toxic compounds (1989-08-15),

7. 4818414 - Slime control for primary filtration systems (1989-04-04),

8. 4812243 - Process for treating caustic cyanide metal wastes (1989-03-14),

9. 4810386 - Two-stage wastewater treatment (1989-03-07),

10. 4749492 - Process for recovering regenerated adsorbent particles and separating (1988-06-07),

Company Overview

Zimpro/Passavant Inc., located in Rothschild, Wisconsin, specializes in advanced water and wastewater treatment technologies. The company focuses on developing innovative solutions that enhance environmental sustainability and resource recovery. With a strong emphasis on engineering and design, Zimpro/Passavant provides comprehensive systems and services tailored to meet the needs of various industries, including municipal, industrial, and commercial sectors. Their expertise encompasses a range of technologies aimed at improving water quality and operational efficiency.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

10 Patents

#4 in Rothschild, WI

#668 in Wisconsin

#29,882 in US

#56,092 in the World

Rothschild, WI, United States of America

Zimpro/passavant Inc.

Forward Citations = 271

10 inventors:

William M Copa (4 out of 7 patents)

Thomas J Vollstedt (3 out of 5 patents)

Curtis D Cooley (2 out of 7 patents)

4. David S Ross (2 out of 6 patents)

5. Claude E Ellis (1 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Zimpro/passavant Inc.. Retrieved from https://idiyas.com/company/zimpro-passavant

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]