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:
Apr. 03, 2012
Filed:
Oct. 14, 2009
Applicants:
Kay Heemann, Kaufering, DE;
Uwe Bohn, Kissing, DE;
Wolfgang Ludwig, Zaisertshofen, DE;
Inventors:
Assignee:
Hilti Aktiengesellschaft, Schaan, LI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 21/08 (2006.01); E21B 44/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A drilling tool includes a hydraulically driven device () for advancing a drilling head () in a bore (), and a flow limiter () arranged in a hydraulic conduit () of the advancing device () for adjusting an advancing speed of the drilling head () in the bore (), with the flow limiter () having a pressure-actuated adjusting member () for adjusting flow of a hydraulic fluid in the hydraulic conduit means () in accordance with a flow volume of a rinsing fluid () for rinsing the bore.