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:
Jun. 01, 2004
Filed:
Sep. 03, 2002
Applicant:
Inventor:
Wolfgang Peetz, Fronreute-Blitzenreute, DE;
Assignee:
Hawera Probst GmbH, Ravensburg, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 1/044 ; E21B 1/036 ;
U.S. Cl.
CPC ...
E21B 1/044 ; E21B 1/036 ;
Abstract
A rock drill ( ) for rotary hammers or the like is proposed in which a conveying helix ( ) having main and secondary webs ( to ) is used. In this case, the convexing helix ( ) is run up to the front region of the drill head ( ) with the core cross section being increased or the flute depth being decreased.