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:
Dec. 27, 2005
Filed:
May. 16, 2003
Applicants:
Ann-cathrin Hedlund, Sandviken, SE;
Göran Hagelin, Sandviken, SE;
Agne Lundquist, Järbo, SE;
Inventors:
Assignee:
Sandvik AB, Sandviken, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B007/00 ;
U.S. Cl.
CPC ...
Abstract
A threaded rock drill element for percussive rock drilling includes a body forming a center axis and having a hardened thread. The thread includes thread crests and thread bottoms and a hardened zone having increased hardness. The hardened zone includes first and second hardened areas extending radially from a crest and bottom (valley), respectively, of the thread, to a boundary curve of the hardened zone. The boundary curve has convex portions extending along the thread crests, and concave portions extending along the thread bottoms.