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:
Jun. 12, 2012
Filed:
Feb. 01, 2011
Jean Buytaert, Mineral Wells, TX (US);
Eugene Edward Miller, Weatherford, TX (US);
Donald Elwin Mcdowell, Millsap, TX (US);
Jean Buytaert, Mineral Wells, TX (US);
Eugene Edward Miller, Weatherford, TX (US);
Donald Elwin McDowell, Millsap, TX (US);
Frank's International, Inc., Houston, TX (US);
Abstract
A close-tolerance expandable bow spring centralizerhaving a first expandable collarA coupled to and spaced apart from a second expandable collarB through a plurality of bow springswherein expandable collarsA,B comprise a plurality of slidably coupled linksthat separate to expand the diameter of the collarsA,B, e.g., upon expansion of an expandable pipe stringon which the centralizeris received. Expandable bow spring centralizermay grip the expandable pipe stringwhen in the collapsed configuration to eliminate the need for a stop collar. Additionally or alternatively, a finmay be connected to each bow spring, and then connected to one or more adjacent finsupon collapse of the bow springsto form a restraining bandthat may be ruptured, e.g., upon expansion of the expandable pipe string