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Waukesha, WI, United States of America

Envirex Inc.

USPTO Granted Patents = 63

Trademarks = 7

Forward Citations = 761

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53 inventors (with patents filed for the assignee):

Peter J Petit (9 out of 9 patents)

James H Wiegand (7 out of 8 patents)

Thomas J Casper (7 out of 14 patents)

4. George W Smith (5 out of 5 patents)

5. Eugene E Mazewski (5 out of 5 patents)

6. John W Wittmann (4 out of 4 patents)

7. John Thomas (4 out of 4 patents)

8. Robert R Cheesman (4 out of 5 patents)

9. William H Boyle (4 out of 4 patents)

10. John A Fillar (3 out of 3 patents)

11. Karl R Hertel (3 out of 4 patents)

12. Susan M Rasper (3 out of 4 patents)

13. Richard E Speece (2 out of 16 patents)

14. Bert Krivec (2 out of 29 patents)

15. Charles Stark Applegate (2 out of 7 patents)

Core Competencies:

Biomass Growth Control

Fluid Bed Biological Reactor

Dissolved Gas Floatation

Backflow Prevention

Wastewater Treatment

Activated Sludge Process

Rotating Biological Contactor

Vaporless Liquid Containment

Polymeric Components

Gravity Belt Thickener

Non-Metallic Transmission Chain

Pressurized Bubble Contactor

63 patents: Sort by Forward Citations

1. 5976365 - Biomass growth control apparatus for fluid bed biological reactor (1999-11-02),

2. 5766491 - Backflow prevention system for media bed reactor (1998-06-16),

3. 5766484 - Dissolved gas floatation device (1998-06-16),

4. 5593589 - Clarifier (1997-01-14),

5. 5584996 - Apparatus and method for distributing liquid containing evolvable glass (1996-12-17),

6. 5552052 - Method of reducing iron fouling in groundwater treatment systems (1996-09-03),

7. 5538635 - Method for dissolving gas in liquid including pressurized bubble (1996-07-23),

8. 5534140 - Bar screen having compound fine screen bar rack (1996-07-09),

9. 5501793 - Traveling water screen including improved basket (1996-03-26),

10. 5489378 - Differential relief mechanism for a traveling water screen (1996-02-06),

11. 5481789 - Method for removing a gear or bearing in circular clarifiers and (1996-01-09),

12. 5470475 - Clarifier (1995-11-28),

13. 5454938 - Bed height sensing device for biological reactor (1995-10-03),

14. 5425874 - Rotating contactor including cross flow media for the biological (1995-06-20),

15. 5423980 - Wastewater treatment apparatus with ice resistant adjustable friction (1995-06-13),

Envirex Inc. is a leading environmental technology company that specializes in providing sustainable solutions for water and wastewater treatment. With over 30 years of industry experience, Envirex offers a wide range of innovative products and services, including membrane filtration systems, aerobic and anaerobic digestion systems, and sludge dewatering equipment. Our solutions are designed to optimize operational efficiency, reduce environmental footprint, and ensure regulatory compliance for municipal and industrial clients worldwide.

This text is generated by artificial intelligence and may not be accurate.

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

63 Patents

#5 in Waukesha, WI

#139 in Wisconsin

#5,530 in US

#11,193 in the World

Waukesha, WI, United States of America

Envirex Inc.

Forward Citations = 761

53 inventors:

Peter J Petit (9 out of 9 patents)

James H Wiegand (7 out of 8 patents)

Thomas J Casper (7 out of 14 patents)

4. George W Smith (5 out of 5 patents)

5. Eugene E Mazewski (5 out of 5 patents)

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