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Forward Citations = 162

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6 inventors (with patents filed for the assignee):

John D Muchow (7 out of 19 patents)

Victor E Derval (3 out of 3 patents)

Richard E Wells (3 out of 3 patents)

4. Maurice Slegers (2 out of 2 patents)

5. Harry R Cove (1 out of 3 patents)

6. Graham J Jones (1 out of 1 patent)

7 patents: Sort by Forward Citations

1. 4199834 - Pig ball transfer unit (1980-04-29),

2. 4116215 - Automatic reset pilot valve (1978-09-26),

3. 4026326 - Actuator pilot for fluid pressure monitoring safety system (1977-05-31),

4. 4017053 - Fluid pressure monitoring safety system (1977-04-12),

5. 4016621 - Device and method for launching and/or retrieving pipeline scrapers (1977-04-12),

6. 3977438 - Means to reset an actuator pilot valve (1976-08-31),

7. 3958592 - Safety shut-off valve (1976-05-25),

Willis Oil Tool Co. is a leading supplier of oilfield equipment and services, specializing in high-quality tools and products for drilling and completion operations. With a focus on innovation and customer satisfaction, Willis Oil Tool Co. has established a strong reputation in the industry for reliability and excellence. From premium drill bits to specialized wellbore cleanout tools, Willis Oil Tool Co. offers a comprehensive range of solutions to meet the needs of oil and gas operators worldwide.

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

Company Badge

USPTO Data Jan 1 1976 - Dec 16 2025

7 Patents

#28 in Long Beach, CA

#9,201 in California

#38,778 in US

Long Beach, CA, United States of America

Willis Oil Tool Co.