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. 24, 2016
Filed:
Feb. 17, 2015
Applicant:
United States Gypsum Company, Chicago, IL (US);
Inventors:
Dennis Mark Lettkeman, Watonga, OK (US);
John Wesley Wilson, Fairview, OK (US);
Doug Blackburn, Port Clinton, OH (US);
Brian K. Ball, Fort Dodge, IA (US);
Raymond A. Kaligian, Geneva, IL (US);
Mike L. Cloud, Canton, OK (US);
Assignee:
UNITED STATES GYPSUM COMPANY, Chicago, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
C04B 11/00 (2006.01); C09K 8/46 (2006.01); E21B 33/138 (2006.01);
U.S. Cl.
CPC ...
C09K 8/46 (2013.01); E21B 33/138 (2013.01);
Abstract
An oil well cementing product comprising DTPA-coated synthetic calcined gypsum, at least one accelerator, at least one retarder, at least one plasticizer and limestone is provided. Also provided are methods for cementing oil wells with mixtures comprising DTPA-coated synthetic calcined gypsum, at least one accelerator, at least one retarder, at least one plasticizer and limestone.