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For the Inventor, By the Inventor

Hebron, IL, United States of America

Filtertek Inc.


USPTO Granted Patents = 52

% Expired Patents = 13.5



Trademarks = 1

Forward Citations = 2,137

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38 inventors (with patents filed for the assignee):

goldMedal Hayden L Leason (9 out of 9 patents)

silverMedal Ricky R Ruschke (6 out of 6 patents)

bronzeMedal 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 Device
Valve Apparatus
Respiratory Device
Check Valve
Bacterial Retentive Filter
Filter Manufacturing Process
Needleless Access Device
Intravenous Filter
Air Eliminator
Sump Filter
Plastic Component
Fuel Tank Filter

52 patents:

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),
Company Overview
Filtertek Inc., headquartered in Hebron, Illinois, specializes in fluid handling technology, focusing on the development and manufacturing of advanced devices for medical applications. The company is known for its expertise in creating fluid handling devices, valve apparatuses, and respiratory devices, as well as critical components like check valves and bacterial retentive filters. With a commitment to innovation, Filtertek also excels in the production of needleless access devices and intravenous filters, serving a vital role in healthcare and fluid management industries.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

Filtertek Inc. USPTO Patent Assignee Logo
52 Patents

#1 in Hebron, IL

#380 in Illinois

#6,760 in US

#13,545 in the World

Hebron, IL (US)
Hebron, IL, United States of America

Filtertek Inc.

Forward Citations = 2,137

38 inventors:

goldMedal Hayden L Leason (9 out of 9 patents)

silverMedal Ricky R Ruschke (6 out of 6 patents)

bronzeMedal 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)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Filtertek Inc.. Retrieved from https://idiyas.com/company/filtertek

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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