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:
Jul. 01, 1997
Filed:
Sep. 22, 1995
Applicant:
Inventor:
Christopher P Hutchinson, Houston, TX (US);
Assignee:
Weatherford U.S., Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175269 ; 166 558 ;
Abstract
Section mills have been invented that have one or more blades whose tops are rotatably extendable outward from a mill body as bottoms of the blade(s) rotate about a fixed point, the blade bottoms rotatably secured to the mill body so that, in response to a downwardly moving wash tube contacting the blades, tops of the blades move out from the mill body. In one aspect the blades have a milling surface which is of such an outward extent and which is parallel to a central longitudinal axis of the mill body when the blades are fully extended so that the blades achieve 'full sweep' milling.