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. 03, 2014
Filed:
Aug. 12, 2009
Rickey J. Thomas, Lineboro, MD (US);
Florian Probst, Hutthurm, DE;
Thomas J. Quinn, Towson, MD (US);
Abhijeet P. Joshi, Baltimore, MD (US);
Alfons K. Wetzl, Salzweg, DE;
Albert Leidl, Passau, DE;
David N. Johnson, Crook, GB;
Rickey J. Thomas, Lineboro, MD (US);
Florian Probst, Hutthurm, DE;
Thomas J. Quinn, Towson, MD (US);
Abhijeet P. Joshi, Baltimore, MD (US);
Alfons K. Wetzl, Salzweg, DE;
Albert Leidl, Passau, DE;
David N. Johnson, Crook, GB;
Black & Decker Inc., Newark, DE (US);
Abstract
A combination drill bit for use in both hand held drills and stationary drill presses has a shanking end, a working end and a helical flute portion between the shanking and working ends. The helical portion has a helix length (L) of The drill bit has a core that is tapered from the working end to the shanking end. A web thickness length at the working end is 10% to 35% of the diameter and the thickness length at the junction of the shanking end is 70% to 90% of the diameter. The drill bit is manufactured from a high speed steel including at least 5% by weight of cobalt.