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:
Jun. 19, 1984
Filed:
Dec. 15, 1981
Applicant:
Inventor:
Christine A Costello, Coraopolis, PA (US);
Assignee:
Calgon Corporation, Pittsburgh, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252 / ; 252 / ;
Abstract
The instant invention is directed to an aqueous drilling fluid comprising an aqueous clay dispersion and a carboxylic functional polyampholyte, or the salt thereof. The instant invention is also directed to the use of the drilling fluid.