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Trademarks = 1

Forward Citations = 99

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9 inventors (with patents filed for the assignee):

Morris T Covington (3 out of 4 patents)

Steven M Griffin (3 out of 3 patents)

William Kenneth LeBlanc (2 out of 6 patents)

4. Mark J Koenig (1 out of 3 patents)

5. Willard D Kaiser (1 out of 6 patents)

6. John T Wall (1 out of 2 patents)

7. Russell E Robertson (1 out of 1 patent)

8. Larry D Hanawalt (1 out of 1 patent)

9. Jon L Shafer (1 out of 3 patents)

8 patents: Sort by Forward Citations

1. 5361622 - Device and method for detection of leaks in pressurized fluid vessels (1994-11-08),

2. 5244004 - Hydraulic pipeline valve operating system (1993-09-14),

3. 4633702 - Torque and friction tester (1987-01-06),

4. 4144743 - Electronic fluid pipeline leak detector and method (1979-03-20),

5. 4102128 - Hand pump system for hydraulic motor (1978-07-25),

6. 4091658 - Electronic fluid pipeline leak detector and method (1978-05-30),

7. 4012944 - Electronic fluid pipeline leak detector and method (1977-03-22),

8. 4005642 - Cross-over port construction for hydraulic motors (1977-02-01),

Shafer Valve Company is a leading manufacturer of high-quality, reliable valves for the oil and gas industry. With over 50 years of experience, Shafer Valve Company prides itself on providing cutting-edge solutions for a variety of applications, from drilling and wellhead control to pipeline and production systems. Their innovative designs and commitment to excellence make them a trusted partner for companies worldwide.

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USPTO Data Jan 1 1976 - Dec 16 2025

8 Patents

#10 in Mansfield, OH

#1,385 in Ohio

#34,863 in US

Mansfield, OH, United States of America

Shafer Valve Company