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Warrendale, PA, United States of America

Usfilter Corporation

USPTO Granted Patents = 35

% Expired Patents = 11.4

Trademarks = 16

Forward Citations = 502

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49 inventors (with patents filed for the assignee):

Darin Lynn St Germain (4 out of 8 patents)

Stephen B Wilcher (4 out of 22 patents)

Li-Shiang Liang (3 out of 73 patents)

4. David J Hunniford (3 out of 9 patents)

5. James Richard Graham (3 out of 9 patents)

6. James Paul Harshman (2 out of 10 patents)

7. John W Arba (2 out of 8 patents)

8. Anil D Jha (2 out of 40 patents)

9. David L Morano (2 out of 8 patents)

10. Cheng Jian Yuan (2 out of 2 patents)

11. Frank L Sassaman, Jr (2 out of 3 patents)

12. Stanley R Kaars (2 out of 2 patents)

13. James L Filson (2 out of 5 patents)

14. Philip M Kemp (2 out of 3 patents)

15. Roy William Martin (2 out of 51 patents)

Core Competencies:

Electrodeionization

Wastewater Treatment

Odor Control

Ion Exchange

Activated Carbon

Hydraulic Mixing

Flow Splitting

Filter Assembly

Sulfur Removal

Grit Removal

Free Radicals

Water Quality

35 patents: Sort by Forward Citations

1. 7208090 - Wastewater treatment control (2007-04-24),

2. 7147785 - Electrodeionization device and methods of use (2006-12-12),

3. 7138049 - Apparatus for reducing nitrate demands in the reduction of dissolved and/or atmospheric sulfides in wastewater (2006-11-21),

4. 7135109 - Filter screen assembly (2006-11-14),

5. 7108781 - Enhanced air and water purification using continuous breakpoint halogenation with free oxygen radicals (2006-09-19),

6. 7101417 - Activated carbon for odor control and method for making same (2006-09-05),

7. 7087172 - Methods for reducing nitrate demands in the reduction of dissolved and/or atmospheric sulfides in wastewater (2006-08-08),

8. 7083733 - Water treatment system and method (2006-08-01),

9. 7063787 - Filter media retaining cap and hold down grid (2006-06-20),

10. 7022269 - Activated carbon for odor control and method for making same (2006-04-04),

11. 7014783 - Flow splitting weir (2006-03-21),

12. 7014754 - Tilt-out frame for a filter screen (2006-03-21),

13. 6997328 - Grit removal assemblies (2006-02-14),

14. 6991735 - Free radical generator and method (2006-01-31),

15. 6991726 - Filter having a media retaining plate (2006-01-31),

Company Overview

Usfilter Corporation, headquartered in Warrendale, PA, specializes in water and wastewater treatment solutions. The company focuses on developing advanced technologies for the purification and management of water resources, catering to both industrial and municipal sectors. With a commitment to sustainability, Usfilter integrates innovative engineering practices to enhance water quality and efficiency. Their expertise spans various aspects of water treatment, including filtration, disinfection, and chemical treatment, positioning them as a key player in the environmental technology landscape.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

35 Patents

#3 in Warrendale, PA

#355 in Pennsylvania

#9,756 in US

#19,181 in the World

Warrendale, PA, United States of America

Usfilter Corporation

Forward Citations = 502

49 inventors:

Darin Lynn St Germain (4 out of 8 patents)

Stephen B Wilcher (4 out of 22 patents)

Li-Shiang Liang (3 out of 73 patents)

4. David J Hunniford (3 out of 9 patents)

5. James Richard Graham (3 out of 9 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Usfilter Corporation. Retrieved from https://idiyas.com/company/usfilter

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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