US Patent 7549491 Hard material bit

Patent 7549491 was granted and assigned to Hilti on June, 2009 by the United States Patent and Trademark Office.

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Patent

Patent attributes

Current Assignee

Hilti

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7549491

Date of Patent

June 23, 2009

Patent Application Number

11796042

Date Filed

April 25, 2007

Patent Citations Received

‌

US Patent 12070807 One-piece cutting head for a drill bit

Patent Primary Examiner

‌

William P. Neuder

Patent abstract

A hard material bit for a rotary-percussion tool (2) includes at least one cutting edge (3), a bottom surface (6) located opposite the at least one cutting edge (3), and at least one attachment surface (8) and at least one free surface (10) both extending transverse to the bottom surface (6) and forming, respectively, a piecewise extending first chamfer (9a) and second chamfer (9b), with the second chamfer (9b) having a width greater than a width of the first chamfer (9a).

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