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:
Jul. 15, 2008
Filed:
Feb. 22, 2005
Applicants:
Michael J. Szymanski, Duncan, OK (US);
Samuel J. Lewis, Duncan, OK (US);
Christian Spindler, Burghausen, DE;
Andrea Fenchl, Wasserburg, DE;
Inventors:
Michael J. Szymanski, Duncan, OK (US);
Samuel J. Lewis, Duncan, OK (US);
Christian Spindler, Burghausen, DE;
Andrea Fenchl, Wasserburg, DE;
Assignees:
Halliburton Energy Services, Inc., Duncan, OK (US);
BASF Contruction Polymers GmbH, Trostberg, DE;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C04B 24/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A fluid loss control additive comprising a crosslinked polymer and sugar and cement compositions comprising the same. In one embodiment, the fluid loss control additive comprises a polymer and a sugar connected by a pH-sensitive crosslink. In some embodiments, the polymer is a polyvinyl alcohol, and the sugar is a sugar alcohol such as sorbitol.