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:
Oct. 15, 1985
Filed:
Jan. 10, 1984
Joseph R Roche, Humble, TX (US);
Hydril Company, Los Angeles, CA (US);
Abstract
A system is disclosed which may alternatively be used as a diverter or as a blowout preventer for a drilling rig. The system comprises a BOP attached above a spool having a hydraulically driven sleeve/piston. An outlet passage in the spool, which may be connected to a vent line, is closed off by the sleeve wall when the spool piston is at rest. Hydraulic ports are connected above and below the BOP annular piston and above and below the spool annular piston. The ports below the BOP piston and above the spool piston are in fluid communication with each other. A hydraulic circuit is provided having two valves between a source and a drain of pressurized hydraulic fluid.