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:
Dec. 28, 2004
Filed:
Sep. 16, 2002
Applicant:
Inventors:
Keith Anthony Fritchley, Hucknall, GB;
Michael Charles Spencer, Melton Mowbray, GB;
Assignee:
Reeves Wireline Technologies Limited, Leicestershire, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 3/316 ;
U.S. Cl.
CPC ...
E21B 3/316 ;
Abstract
A drillpipe sub ( ) comprises a shaft ( ), a first frustoconical member ( ) encircling, and fixedly mounted on, the shaft ( ), and a second, opposed frustoconical member ( ) encircling, and slidably mounted on, the shaft ( ). The first frustoconical member ( ) is bonded at its base ( ) to the base ( ) of the second frustoconical member ( ).