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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.:

US 4977227 B1

PDFFull Text
Date of Patent:
Dec. 11, 1990

Filed:

Nov. 28, 1988

Lignosulfonic graft copolymer as a cement dispersant

Applicant:
Inventors:

Shin'ichi Negami, Gotenba, JP;

Hiroshi Nomachi, Chigasaki, JP;

Toru Nemoto, Chigasaki, JP;

Yoshio Tanaka, Komae, JP;

Akira Ohta, Chigasaki, JP;

Assignee:

Sandoz Ltd., Basle, CH;

Attorneys:

Sharkin; Gerald D.

Honor; Robert S.

Tewell; Walter F.

Primary Examiner:

Nathan M Nutter

Int. Cl.
CPC ...
C08H / ; C09K / ; C09D / ;
U.S. Cl.
CPC ...
527400 ; 523131 ; 106823 ;
Abstract

This invention provides a cement dispersant of a lignosulfonic acid graft copolymer, obtained by a redox free radical reaction of lignosulfonic acid or its salts with one or more acrylic or vinylic monomers containing functional groups, in an aqueous solution in the presence of a radical initiator, e.g, redox catalyst. The lignosulfonic acid graft copolymer has a molecular weight distribution of from 5.times.10.sup.2 to 5.times.10.sup.6.

Find Patent Forward Citations

Negami, Shin'ichi. (1990). Lignosulfonic graft copolymer as a cement dispersant (U.S. Patent No. 4977227). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4977227

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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