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:
Jan. 13, 2004
Filed:
Oct. 05, 2001
Applicant:
Inventors:
Werner Kleine, Achim, DE;
Hans-Werner Bongers-Ambrosius, Munich, DE;
Assignee:
Hilti Aktiengesellschaft, Schaan, LI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 1/044 ;
U.S. Cl.
CPC ...
E21B 1/044 ;
Abstract
A twist drill bit ( ) for use in rock has a helical land ( ) arranged between a chuck insert end ( ) and a tool head ( ), and extends helically around a rotational axis (A) extending along a shaft ( ). The radially outer surface ( ) of the land ( ) has its width (x) increasing as it approaches the tool head ( ).