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:
Jul. 27, 1976
Filed:
Dec. 03, 1974
Applicant:
Inventors:
Erik Ahlberg, Nacka, SW;
Ingvar Carlvik, Lidingo, SW;
Bernt Soren Liljekvist, Sandviken, SW;
Anders Carl Hagglund, Sandviken, SW;
Assignees:
Sandvik Aktiebolag, Sandviken, SW;
Atlas Copco Aktiebolag, Nacka, SW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21C / ; F16F / ;
U.S. Cl.
CPC ...
173128 ; 175320 ; 181 / ;
Abstract
Drill rod for percussion drilling comprising a central rod member and a sleeve member disposed therearound for a major portion of its length. An annular space is provided between said rod and sleeve members, said space being partially filled with one or several elements of noise-suppressing material, said elements when in plural being spaced from each other.