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:
Nov. 08, 1988
Filed:
Dec. 23, 1986
Applicant:
Inventor:
Jack B Ottestad, La Jolla, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
299 94 ; 175414 ; 175405 ; 294 55 ;
Abstract
A percussive tool, and a tool bit for the percussive tool for cutting the face of a deposit to be extracted. The tool bit is a circularly cylindrical columnar structure driven axially by the percussive tool. It is laterally unsupported and unobstructed for a substantial reference length. It has a circular cutting edge whose outer diameter increases as it extends axially away from its cutting end. Its ratio of wall thickness to outer diameter, and reference length to wall diameter, are such as to resist permanent lateral deformation and euler-type columnar collapse. When mounted, the bit is rotatable around its own central axis.