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For the Inventor, By the Inventor

Longview, TX, United States of America

Stemco Inc


USPTO Granted Patents = 39

% Expired Patents = 12.8



Trademarks = 28

Forward Citations = 570

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55 inventors (with patents filed for the assignee):

goldMedal Mark J Kranz (9 out of 11 patents)

silverMedal Mark N Gold (7 out of 14 patents)

bronzeMedal Daniel Trejo Jimenez (5 out of 13 patents)

4.  Laurence B Winn (5 out of 5 patents)

5.  Andrew F Smith (4 out of 15 patents)

6.  Jeffrey J Grossmann (4 out of 17 patents)

7.  James C Steph (3 out of 3 patents)

8.  Michael James Massey (3 out of 5 patents)

9.  Barry E Braun (3 out of 3 patents)

10.  Paul S Perry (3 out of 3 patents)

11.  Thomas Scott Breidenbach (2 out of 38 patents)

12.  Jared A Niemiec (2 out of 7 patents)

13.  Robert R Cholnoky (2 out of 3 patents)

14.  Michael W Polidori (2 out of 8 patents)

15.  Court S Hinricher (2 out of 6 patents)


Core Competencies:
Aerodynamic Drag
Tire Inflation
Vehicle Condition
Hub Assembly
Lubricant Distribution
Brake Stroke Sensor
Remote Communication
Resin-Based Friction
Venturi Tube
Locking Nut
Cargo Bodies
Accelerometer

39 patents:

1. 12658355 - Coil substrate and electronic apparatus including the same (2026-06-16),
2. 9868477 - Aerodynamic drag reducing apparatus (2018-01-16),
3. 9683596 - Locking nut (2017-06-20),
4. 9669501 - Steering spindle repair kit and associated apparatus and methods (2017-06-06),
5. 9545960 - Rear-mounted aerodynamic structure for truck cargo bodies (2017-01-17),
6. 9545876 - On-board low-power vehicle condition indicator (2017-01-17),
7. 9457847 - Rear-mounted aerodynamic structures for cargo bodies (2016-10-04),
8. 9440689 - Aerodynamic structures secured to the underbody of cargo bodies (2016-09-13),
9. 9440688 - Rear-mounted retractable aerodynamic structure for cargo bodies (2016-09-13),
10. 9387731 - Central tire inflation system pressure regulator (2016-07-12),
11. 9346496 - Aerodynamic drag reducing apparatus (2016-05-24),
12. D749482 - Hub cap (2016-02-16),
13. 9221308 - Central tire inflation system rotary air union (2015-12-29),
14. 9090206 - On-board low-power vehicle condition indicator (2015-07-28),
15. 9062705 - Lockable single piece nut assembly (2015-06-23),
Company Overview
Stemco Inc, headquartered in Longview, Texas, specializes in the development and manufacturing of advanced products for the commercial vehicle industry. The company focuses on enhancing vehicle performance and safety through innovative solutions, including wheel end components, air management systems, and suspension products. With a commitment to quality and reliability, Stemco serves a diverse clientele, contributing to the efficiency and longevity of heavy-duty vehicles across North America and beyond.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

39 Patents

#1 in Longview, TX

#488 in Texas

#8,823 in US

#17,448 in the World

Longview, TX (US)
Longview, TX, United States of America

Stemco Inc

Forward Citations = 570

55 inventors:

goldMedal Mark J Kranz (9 out of 11 patents)

silverMedal Mark N Gold (7 out of 14 patents)

bronzeMedal Daniel Trejo Jimenez (5 out of 13 patents)

4.  Laurence B Winn (5 out of 5 patents)

5.  Andrew F Smith (4 out of 15 patents)

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

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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