For the Inventor, By the Inventor

Enter assignee name

Hebron, IL, United States of America

Filtertek Inc.

USPTO Granted Patents = 52

% Expired Patents = 13.5

CIPO Patents = 2

EPO Patents = 3

Trademarks = 1

Forward Citations = 2,137

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38 inventors (with patents filed for the assignee):

Hayden L Leason (9 out of 9 patents)

Ricky R Ruschke (6 out of 6 patents)

Rick R Ruschke (6 out of 6 patents)

4. Jan W M Mijers (5 out of 6 patents)

5. Ralph L Davis (5 out of 6 patents)

6. Edward Kandel (4 out of 4 patents)

7. John A Leahey (4 out of 4 patents)

8. Andrew J Boast (4 out of 4 patents)

9. Thomas A Cain (4 out of 4 patents)

10. Ronald J Kay (3 out of 7 patents)

11. Antonio Chiga (3 out of 5 patents)

12. Michael Leonhard (2 out of 6 patents)

13. Brendan Hogan (2 out of 19 patents)

14. Mark A Kinsley (2 out of 2 patents)

15. Steven B McGaw, Jr (2 out of 2 patents)

Core Competencies:

Fluid Handling Devices

Valve Apparatus

Respiratory Device Connection

Check Valves

Bacterial Retentive Filters

Filter Manufacturing Processes

Needleless Access Devices

Intravenous Filters

Sump Filters

Air Eliminators

Fuel Tank Filters

Plastic Components with O-Ring Retainers

52 patents: Sort by Forward Citations

1. 8038123 - Fluid handling device and method of making same (2011-10-18),

2. 7997293 - Valve apparatus, combination filter valve assemblies and devices, systems, and methods including the same (2011-08-16),

3. 7717116 - Apparatus for connecting a respiratory device with a patient (2010-05-18),

4. 7673653 - Check valve (2010-03-09),

5. 7520489 - Fluid handling device and method of making same (2009-04-21),

6. 7516765 - Air vent foil cutter (2009-04-14),

7. 7360556 - Check valve (2008-04-22),

8. 7354470 - Multiple retainer bridge (2008-04-08),

9. D564092 - Valve for fluids, especially for the medical technique (2008-03-11),

10. 7306768 - Filter for medical and laboratory use, especially for blood analysis and the like (2007-12-11),

11. 7282140 - Sump filter with filter element cartridge (2007-10-16),

12. D541935 - Valve for fluids, especially for the medical technique (2007-05-01),

13. 7141097 - Bacterial retentive, air venting, intravenous filter (2006-11-28),

14. 7083722 - Filter manufacturing process using a combined welding and cutting step (2006-08-01),

15. 7041217 - Filter rings (2006-05-09),

Filtertek Inc. is a leading global provider of engineered filtration products and solutions. With over 50 years of experience, Filtertek delivers innovative and reliable filtration solutions for a wide range of industries including medical, pharmaceutical, automotive, and consumer goods. Their diverse product portfolio includes custom filter solutions, membrane technologies, venting solutions, and syringe filters, among others. Filtertek is committed to delivering high-quality products that exceed customer expectations and contribute to a cleaner, healthier, and safer world.

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

Company Badge

USPTO Data Jan 1 1976 - Sep 15 2026

52 Patents

#1 in Hebron, IL

#380 in Illinois

#6,754 in US

#13,523 in the World

Hebron, IL, United States of America

Filtertek Inc.

Forward Citations = 2,137

38 inventors:

Hayden L Leason (9 out of 9 patents)

Ricky R Ruschke (6 out of 6 patents)

Rick R Ruschke (6 out of 6 patents)

4. Jan W M Mijers (5 out of 6 patents)

5. Ralph L Davis (5 out of 6 patents)

Please report any incorrect information to [email protected]

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