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. 03, 2001
Filed:
Feb. 25, 1999
Applicant:
Inventors:
Mark Carmichael, Aboye, GB;
Paul Howlett, Cults, GB;
Assignee:
Specialised Petroleum Services Limited, Aberdeenshire, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 3/406 ;
U.S. Cl.
CPC ...
E21B 3/406 ;
Abstract
A tool or sub for use in a well bore is adapted to manipulate the circulation path of fluid through a drill string or work string in which the tool is connected. The apparatus has a body member defining an axial flow path with one or more radial outlets that may be opened or closed by respective valve members in use.