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:
May. 23, 1989
Filed:
Aug. 28, 1987
John H Walker, Bartlesville, OK (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
An improved method for protecting a drill pipe casing from a rotatable string of drill pipe longitudinally extended therethrough. The method involves positioning a collar structure circumferentially around the upper end of one pipe section which is internally threaded and then thereafter engaging therewith the lower end of a second pipe section which is externally threaded and engageable with said first pipe section. The collar structure is formed of a poly(arylene sulfide) and is a single unitary structure having circumferentially extended outer surfaces which are adapted to resist spinning with the drill pipe string positioned in the casing structure.