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:
Mar. 24, 2009
Filed:
Jan. 18, 2006
John E. Campbell, Houston, TX (US);
Charles H. Dewey, Houston, TX (US);
Lance D. Underwood, Cypress, TX (US);
Ronald G. Schmidt, Tomball, TX (US);
John E. Campbell, Houston, TX (US);
Charles H. Dewey, Houston, TX (US);
Lance D. Underwood, Cypress, TX (US);
Ronald G. Schmidt, Tomball, TX (US);
Smith International, Inc., Houston, TX (US);
Abstract
An expandable drilling apparatus is deployed upon a distal end of a drillstring and includes a cutting head and a substantially tubular main body adjacent the cutting head providing a plurality of axial recesses configured to receive arm assemblies configured to translate between a retracted and an extended position. A flow switch actuates the arm assemblies when a drilling fluid pressure exceeds an activation value and the drilling apparatus includes a biasing member to reset the arm assemblies when the drilling fluid pressure falls below a reset value.