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:
Oct. 30, 1990
Filed:
Jul. 20, 1989
Applicant:
Inventor:
Eugen Magyari, Gams, CH;
Assignee:
Hilti Aktiengesellschaft, Furstentum Liechtenstein, LI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23B / ;
U.S. Cl.
CPC ...
408 59 ; 408204 ;
Abstract
A hollow drilling tool includes a tubular support with cutting members inserted in axially extending recesses in its leading end. The cutting members alternately project radially outwardly from and radially inwardly from the outer and inner surfaces of the support. An effective removal of drilled materials is possible by partly annular gaps between the cutting members and the borehole surface and the surface of the drilled core.