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:
Aug. 03, 1999
Filed:
May. 01, 1998
Bobby Corte, Sr, Houma, LA (US);
Cor-val Services, Inc., , US;
Abstract
A method of rebuilding an annular blow out preventer of the type having a head with threads that attach it to the body of the blow out preventer involves the removal of about 1 to 11/2) of the threads (e.g., if total thread revolutions equal seven (7) revolutions) closest to the internal bore and piston of the apparatus. An annular groove is formed at the interface between the head and the body. An annular seal, preferably a lip type seal, is positioned at this interface at the annular groove. The seal isolates the threads from the upper hydraulic chamber that is used to move the piston portion of the apparatus. This method prevents contamination and/or corrosion of the threads.