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. 07, 1986
Filed:
May. 24, 1985
Applicant:
Inventor:
William R Garrett, Houston, TX (US);
Assignee:
Smith International, Newport Beach, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
175230 ; 137864 ; 175325 ; 175 94 ;
Abstract
Automatic Hydraulic Thruster for hole boring including a mandrel and sleeve forming two expandable chambers with plural wall anchor means annularly disposed about the sleeve responsive to pressure differential between one chamber and the bore hole pressure and three-way valve means for automatically connecting the chambers respectively first with mandrel pressure and bore hole pressure and then vice versa.