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:
May. 28, 2002
Filed:
Apr. 17, 2000
Halliburton Energy Services, Inc., Carrollton, TX (US);
Abstract
A double-tube core drill wherein the inner tube ( ) is connected to the outer tube ( ) by a multi-element needle and/or ball bearing ( ), allows for the inner tube ( ) to be made rigid and prevents it from rotating along with the outer tube ( ). The extraction device ( ) and the inner wall ( ) of the tube are preferably covered with an antifriction coating. A set of stabilizing elements ( ) are spread along the outer tube to stabilize the inner tube ( ). Said inner tube has a tapered shoe ( ) provided with a lower bevelled lip ( ). The drill also comprises a device for indicating that the core has jammed in the inner tube ( ) and a sealing device ( ) designed to receive a ball ( ) provided for sealing the inner tube ( ) of said core drill.