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:
Feb. 11, 1986
Filed:
Feb. 13, 1984
Applicant:
Inventor:
Evon Martins, Somerville, NJ (US);
Assignee:
Engelhard Corporation, Menlo Park, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252 / ; 2523155 ;
Abstract
A drilling fluid comprises uncalcined colloidal attapulgite clay and up to about 10% by weight (of the weight of attapulgite clay) of a barium compound additive such as BaO or Ba(OH).sub.2. The admixture of clay and barium compound may be slurried in either fresh or salt water to provide an aqueous drilling fluid of significantly higher yield than that attainable with prior art drilling fluids.