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. 25, 1986
Filed:
Mar. 23, 1984
Applicant:
Inventors:
Michio Uemura, Kiryu, JP;
Yutaka Sato, Gunma, JP;
Masaru Nakamura, Gunma, JP;
Toyoshi Iida, Gunma, JP;
Assignee:
Japan Metals and Chemicals Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252 / ; 252 / ;
Abstract
A drilling fluid additive comprising a complex compound or complex compounds, at least one compound to be selected out of a group of compounds of titanium, zirconium and hafnium belonging to group IVb of the periodic table and, as desired, at least one lignin ensures, for a long period, significantly improved mud functions even at elevated temperatures under high pressure such as encountered in the depths of the earth.