The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 2011
Filed:
Jun. 26, 2008
Applicant:
Charles David Willis, Granbury, TX (US);
Inventor:
Charles David Willis, Granbury, TX (US);
Assignee:
Harbison-Fisher, Inc., Crowley, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 17/07 (2006.01); F04B 39/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A stress and torque reducing tool has a plunger that reciprocates inside of a body. The tool is connected between the pump and the sucker rod string and reduces stress transmitted therebetween. The body and plunger have longitudinally extending surfaces located at the plunger upper end portion, which surfaces cooperate and limit rotation of the body with respect to the plunger. An upper fluid port is located in an upper end of the body, while one or more lower fluid ports are located in a lower end of the body.