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:
May. 19, 1987
Filed:
Apr. 16, 1984
Applicant:
Inventors:
Joseph Schapira, Paris, FR;
Jacques Vincent, Mareil Marly, FR;
Daniel Chaillou, Asnieres, FR;
Jacques Schild, Gennevilliers, FR;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252-8511 ; 252-851 ;
Abstract
Process for controlling the swelling of clays of bentonite type clays in the presence of salt-water in the preparation of drilling fluids, comprising the steps of