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. 09, 1995
Filed:
Jul. 30, 1993
Applicant:
Inventor:
Kenneth J Schmitt, Spring, TX (US);
Assignee:
Stren Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
270747 ; 210108 ; 210170 ; 210411 ; 2104165 ; 210791 ;
Abstract
A filter assembly for filtering particulate matter from well fluids to be pumped by a downhole pump in an oil well including a filter and apparatus to reverse the flow through the filter in response to a pre-selected level of differential pressure across the filter, the apparatus including a check valve which opens to allow fluid to flow through to operate a piston to open a pump valve and allow fluid flow out of the pump.