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:
Mar. 30, 2010
Filed:
Dec. 27, 2006
Applicant:
Benny J. Williams, Godley, TX (US);
Inventor:
Benny J. Williams, Godley, TX (US);
Assignee:
Harbison-Fischer, Inc., Crowley, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B 39/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A downhole pump has a barrel and a plunger which reciprocate with respect to each other. The plunger has a first portion with a first seal, a second portion and a third portion with a second seal. The second portion is intermediate the first and second portions. A balancing chamber is formed between the plunger second portion and the barrel. The balancing chamber communicates with the plunger interior by way of an opening. A sand snare chamber is provided with respect to the opening so as to prevent sand from contacting the seals in the balancing chamber.