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. 29, 2021
Filed:
Feb. 04, 2019
Applicant:
Denka Company Limited, Tokyo, JP;
Inventors:
Akihiro Yamashita, Niigata, JP;
Kosuke Watanabe, Niigata, JP;
Assignee:
DENKA COMPANY LIMITED, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/487 (2006.01); C08F 218/04 (2006.01); C09K 8/44 (2006.01); C04B 24/26 (2006.01); C08F 218/08 (2006.01);
U.S. Cl.
CPC ...
C09K 8/44 (2013.01); C04B 24/2635 (2013.01); C08F 218/04 (2013.01); C08F 218/08 (2013.01); C09K 8/487 (2013.01);
Abstract
An additive for oil well cement contains a vinyl alcohol polymer and has good fluid loss reducing performance. The additive for oil well cement is a saponified product of a copolymer of a vinyl ester monomer and a multifunctional monomer, and has a degree of saponification of 70 to 95 mol % and a viscosity-average degree of polymerization of 1000 to 10000.
Yamashita, Akihiro. (2021). Additive for oil well cement and cement slurry using said additive for oil well cement (U.S. Patent No. 11046880). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/11046880
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile