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:
Mar. 17, 1981
Filed:
May. 18, 1979
Fred K Fox, Houston, TX (US);
Martin L Tomek, Houston, TX (US);
Engineering Enterprises, Inc., Houston, TX (US);
Abstract
A well drilling tool is disclosed as having an inner tubular member rotatably supported from an outer tubular member by means of bearings contained within an annular lubricant chamber between them. An annular chamber is formed in an inner tubular member to provide a reservoir for supplying additional lubricant to the chamber to replace that which is lost during use of the tool. An annular piston is sealably slidable within the reservoir, and drilling fluid, which is circulated through a passageway through the tool, is admitted to one end of the reservoir by a port in the inner member to urge the piston toward the other end of the reservoir which connects with the lubricant chamber.