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:
Sep. 23, 1997
Filed:
Mar. 08, 1996
Applicant:
Inventors:
Emmanuel Detournay, Roseville, MN (US);
Andrew Drescher, New Brighton, MN (US);
David A Hultman, Cambridge, MN (US);
Assignee:
Regents of the University of Minnesota, Minneapolis, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 84 ; 7315209 ; 73866 ;
Abstract
A portable frame that includes a movable support for supporting a cutting tool used for engaging a rock sample, and upon relative movement between the rock sample and the cutter, the cutter will make a constant depth cut at a constant velocity. During the cut, the forces parallel to the direction of displacement and perpendicular to the direction are measured, and both cohesion and internal friction angle, which are parameters characterizing the rock strength, the internal friction angle, which is a true measure of the rock strength, can be determined.