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:
Nov. 02, 2004
Filed:
May. 14, 2001
Applicant:
Inventor:
Roger Sandström, Fagersta, SE;
Assignee:
Uniroc AB, Fagersta, SE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 1/7042 ; F16D 1/00 ; F16L 1/506 ;
U.S. Cl.
CPC ...
E21B 1/7042 ; F16D 1/00 ; F16L 1/506 ;
Abstract
A thread coupling for a drill string for percussive drilling has a male thread ( ) and a cooperating female thread ( ). The male thread is arranged on a first drill string element ( ) having a first impact surface ( ). The female thread is arranged on a second drill string element ( ) having a second impact surface ( ). The male and female threads are conical, and the crests ( ) of the male thread ( ) have a radius of curvature more than thirty degrees of the pitch of the thread.