For the Inventor, By the Inventor

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Houston, TX, United States of America

Production Technologies International Inc.

USPTO Granted Patents = 3

Forward Citations = 607

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6 inventors (with patents filed for the assignee):

Kenneth J Schmitt (3 out of 14 patents)

Ronald Marshall Bass (2 out of 55 patents)

Bernard J Eastlund (2 out of 11 patents)

4. Gordon O Cates (1 out of 1 patent)

5. John M Harrison (1 out of 1 patent)

6. Douglas C Anderson (1 out of 1 patent)

3 patents: Sort by Forward Citations

1. 5207273 - Method and apparatus for pumping wells (1993-05-04),

2. 4861074 - Tubing collar (1989-08-29),

3. 4716960 - Method and system for introducing electric current into a well (1988-01-05),

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USPTO Data Jan 1 1976 - Dec 16 2025

3 Patents

#1,188 in Houston, TX

#4,679 in Texas

#71,953 in US

Houston, TX, United States of America

Production Technologies International Inc.

Forward Citations = 607

6 inventors:

Kenneth J Schmitt (3 out of 14 patents)

Ronald Marshall Bass (2 out of 55 patents)

Bernard J Eastlund (2 out of 11 patents)

4. Gordon O Cates (1 out of 1 patent)

5. John M Harrison (1 out of 1 patent)

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