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For the Inventor, By the Inventor

Houston, TX, United States of America

Power Well Services, L.p.


USPTO Granted Patents = 3

Forward Citations = 7

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3 inventors (with patents filed for the assignee):

goldMedal John McCaskill (3 out of 7 patents)

silverMedal Robert Frank Schmidt (3 out of 6 patents)

bronzeMedal David Anthony Schmidt (3 out of 6 patents)


3 patents:

1. 7231932 - Apparatus and methods for servicing a hydraulic choke (2007-06-19),
2. 7159604 - Manipulator system for servicing a hydraulic choke (2007-01-09),
3. 7124770 - Shear mechanism for backpressure relief in a choke valve (2006-10-24),
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USPTO Data Jan 1 1976 - Sep 22 2026

3 Patents

#1,208 in Houston, TX

#4,785 in Texas

#73,727 in US

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

Power Well Services, L.p.

Forward Citations = 7

3 inventors:

goldMedal John McCaskill (3 out of 7 patents)

silverMedal Robert Frank Schmidt (3 out of 6 patents)

bronzeMedal David Anthony Schmidt (3 out of 6 patents)

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