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:
Apr. 13, 1976
Filed:
Sep. 30, 1974
Applicant:
Inventor:
Duane K Russell, Bothell, WA (US);
Assignee:
Western Gear Corporation, Everett, WA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175 52 ; 166315 ; 173 57 ; 173164 ; 175 85 ; 214-25 ;
Abstract
A two-ram hydraulic drilling rig is provided with a lateral support frame. The rams have rods connected through a tension structure with a power swivel. The power swivel has a removable swivel stem assembly for allowing through-swivel positioning of drill pipe, particularly for tripping.