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:
Feb. 03, 2009
Filed:
Feb. 22, 2007
James L. Overstreet, Tomball, TX (US);
Robert J. Buske, The Woodlands, TX (US);
John F. Bradford, Iii, Katy, TX (US);
Caleb A. Rickabaugh, Spring, TX (US);
James L. Overstreet, Tomball, TX (US);
Robert J. Buske, The Woodlands, TX (US);
John F. Bradford, III, Katy, TX (US);
Caleb A. Rickabaugh, Spring, TX (US);
Baker Hughes Incorporated, Houston, TX (US);
Abstract
An earth-boring bit has bit legs having hardfacing covering the majority of the outer surface. The hardfacing may have gaps at an area surrounding the ball plug and an area around a fixture dimple. The hardfacing may be multi-layer, with the layers differing in composition. Recesses may be located at the leading and trailing edges of the supporting metal so as to provide a thicker area of hardfacing at these corners. The supporting metal of the outer surface of the bit leg may also have an upper cylindrical section and a lower tapered section. The hardfacing has a constant outer diameter but will taper in thickness in the lower tapered section. The thickness of the hardfacing may also vary in a circumferential direction with a greater thickness over at least one of the corners.