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. 25, 2001
Filed:
Jan. 19, 2000
Applicant:
Inventors:
Pertti Koivunen, Tampere, FI;
Simo Sanerma, Lemp{umlaut over (aa)}lä, FI;
Erkki Eilo, Pirkkala, FI;
Assignee:
Sandvik Tamrock Oy, Tampere, FI;
Primary Examiner:
Int. Cl.
CPC ...
E21B 4/400 ;
U.S. Cl.
CPC ...
E21B 4/400 ;
Abstract
A method of controlling rock drilling wherein the cut length changes from a predetermined cut length, the drilling length is changed by transferring the position of the pattern in the longitudinal direction of the tunnel so that the positions of the end points of the holes remain essentially the same with respect to one another, and a collaring surface is crosswise of the tunnel and different from the actual rock surface.