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. 16, 1989
Filed:
Feb. 08, 1988
Steven G Petermann, Plano, TX (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
A borehole centralizer includes an elongated shank member on which opposed head members are slidable and are connected to articulated arms which are movable radially inwardly and outwardly to centralize a tubing string or apparatus in a borehole in which the centralizer is disposed. A tension coil spring is disposed around the shank and connected to the opposed head members for exerting an axially directed force which is converted to radially directed forces urging the articulated arms radially outwardly. The centralizer is operable to exert substantially constant outward biasing forces on the articulated arms for a relatively wide range of borehole diameters.