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:
Jul. 26, 1988
Filed:
Feb. 19, 1987
Applicant:
Inventors:
Assignee:
Tohoku University, Sendai, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
73153 ; 73799 ;
Abstract
The disclosed method introduces a pressure effectivity factor h, so as to continuously determine fracture toughness K.sub.IC of rock during core boring by using the equation of
Quick Actions:
Sekine, Hideki. (1988). Method for determining fracture toughness of rock by core boring (U.S. Patent No. 4759214). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4759214
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