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. 22, 2010
Filed:
Oct. 30, 2008
Peter Gstach, Schaan, LI;
Berthold Aumueller, Grafenwöhr, DE;
Peter Gstach, Schaan, LI;
Berthold Aumueller, Grafenwöhr, DE;
Hilti Aktiengesellscahft, Schaan, LI;
Abstract
A thread-tapping screw () has a thread () extending, starting from the screw shaft free end (), at least along a portion of the shaft length and a height of which constantly decreasing toward the free end () of the shaft (), and a plurality of cutting bodies () formed of a material having a greater hardness than hardness of the thread (), located in recesses () formed in the thread () and opening radially outwardly and having, respectively, a radial outer profile () projecting, at least partially, beyond the thread and a height (A, B, C, D, E) of which decreases toward the free end () of the shaft () stepwise.