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:
Nov. 01, 2022
Filed:
May. 10, 2019
Applicant:
Epiroc Drilling Tools Ab, Orebro, SE;
Inventors:
Rual Abreu, Johannesburg, ZA;
Paolo Ettore Pastorino, Johannesburg, ZA;
Greig Knox, Johannesburg, ZA;
Assignee:
EPIROC DRILLING TOOLS AB, Orebro, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D 21/00 (2006.01); F16B 31/02 (2006.01);
U.S. Cl.
CPC ...
E21D 21/0026 (2013.01); E21D 21/008 (2013.01); F16B 31/021 (2013.01);
Abstract
Disclosed is a method of adapting a metal bar, for use as a rock bolt, to ensure that the bar will break in a predictable manner, the method including the step of removing material from the bar in a circumferential band to reduce a diameter of the bar within the band to a minor diameter thereby to provide a failure zone within which the bar will break if subjected to enough tensile load.