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:
Mar. 30, 2004
Filed:
Jan. 16, 2002
Werner Kleine, Achim, DE;
Hans-Werner Bongers-Ambrosius, Munich, DE;
Udo Hauptmann, Landsberg/Lech, DE;
Martin Richter, Freising, DE;
Hilti Aktiengesellschaft, Schaan, LI;
Abstract
A rock drilling tool including a tip ( ) formed of a hard material and provided at one end of the tool stem and a shank ( ) provided at an opposite end of the stem ( ) and having a plurality of entrain grooves ( ) extending up to a free end surface of the shank ( ), with an entire recessed surface ( ) of an entrain groove ( ) being larger than an entire outer surface ( ) of a groove-forming rest web ( ), and with a mean rest cross-sectional area (A′), which is measured within an axial section of the drilling tool having a length at least equal to a product of a natural logarithm base and a stem diameter (e×D), deviating from a mean rest cross sectional area (A) along the entire tool length maximum by 20%.