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:
Dec. 08, 2020
Filed:
Apr. 14, 2020
Applicant:
S.p.c.m. SA, Andrezieux Bouthéon, FR;
Inventors:
Cédrick Favero, Andrezieux Bouthéon, FR;
Bruno Giovanneti, Andrezieux Bouthéon, FR;
Olivier Ratel, Andrezieux Bouthéon, FR;
Pierrick Cheucle, Andrezieux Bouthéon, FR;
Assignee:
S.P.C.M. SA, Andrezieux Boutheon, FR;
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/12 (2006.01); C08F 2/58 (2006.01); C08F 220/58 (2006.01);
U.S. Cl.
CPC ...
C09K 8/12 (2013.01); C08F 220/585 (2020.02);
Abstract
The invention relates to a water-soluble branched sulfonated amphoteric polymer, for a water-based drilling fluid, wherein the polymer is obtained by precipitation polymerization, in a mixture of polar solvents, of at least one N,N'-dialkylacrylamide monomer and one sulfonic acid-containing monomer, in the presence of tetraallylammonium halide as branching agent. The invention also relates to a water-based drilling fluid for subterranean boreholes, including: