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. 09, 1993
Filed:
Nov. 12, 1991
Applicant:
Inventor:
Thomas J Landsberg, Princeton, NJ (US);
Assignee:
Simmons-Rand Company, Bristol, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D / ;
U.S. Cl.
CPC ...
4052591 ; 411452 ;
Abstract
A friction rock stabilizer includes a center spine, a plurality of arms extending radially outwardly therefrom, for urging a plurality of friction surfaces into resilient contact with a borehole wall. The friction surfaces are positioned on an arc of a circle measured around the center axis of the borehole, which arc spans a center angle of at least 180 degrees.