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. 11, 2010
Filed:
Nov. 15, 2004
Applicants:
Mahlon Dennis, Kingwood, TX (US);
Thomas Dennis, Kingwood, TX (US);
Eric Twardowski, Spring, TX (US);
Inventors:
Mahlon Dennis, Kingwood, TX (US);
Thomas Dennis, Kingwood, TX (US);
Eric Twardowski, Spring, TX (US);
Assignee:
Dennis Tool Company, Houston, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21B 10/26 (2006.01);
U.S. Cl.
CPC ...
Abstract
A drilling tool () includes a pilot bit () and a plurality of mills () encircling the pilot bit. The pilot bit and the plurality of mills are each driven by a separate, hydraulically powered turbine or positive displacement motor. () The drilling tool does not include a transmission for transmitting power from the turbine or motor to any of the plurality of mills or the pilot bit.