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:
Nov. 24, 1981
Filed:
Feb. 05, 1979
Applicant:
Inventors:
Barry S Welton, Midland, TX (US);
G Wayne Westerman, Midland, TX (US);
Assignee:
End Devices, Inc., Midland, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ;
U.S. Cl.
CPC ...
417 12 ; 417 44 ; 417 53 ; 318474 ;
Abstract
A process and system for distinguishing between actual and false pump off of a well and for shutting in the well only upon the occurrence of actual pump off. The process and system employs the principle that pump off may occur only after a not pumped off condition has been detected.