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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 12668757 B1

PDFFull Text
Date of Patent:
Jun. 30, 2026

Filed:

Dec. 05, 2024

Lubricating oil viscosity index improver and lubricating oil composition containing the same

Applicant:

Dl Chemical Co., Ltd., Seoul, KR;

Inventors:

Jin Hun Ju, Daejeon, KR;

Eui Seong Baek, Seoul, KR;

Myung Hyun Kim, Seoul, KR;

Yong Hwan Shin, Seoul, KR;

Sang Deok Mun, Daejeon, KR;

Sang Eun Yoon, Daejeon, KR;

Je Hyeon Wie, Daejeon, KR;

Soo Hwan Park, Daejeon, KR;

Assignee:

DL Chemical CO., LTD., Seoul, KR;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Ellen M Mcavoy

Int. Cl.
CPC ...
C10M 143/04 (2006.01); C08F 210/16 (2006.01); C10M 169/04 (2006.01); C10N 20/04 (2006.01); C10N 30/02 (2006.01); C10N 40/25 (2006.01);
U.S. Cl.
CPC ...
C10M 143/04 (2013.01); C08F 210/16 (2013.01); C10M 169/041 (2013.01); C08F 2800/10 (2013.01); C10M 2203/003 (2013.01); C10M 2205/024 (2013.01); C10N 2020/04 (2013.01); C10N 2030/02 (2013.01); C10N 2040/252 (2020.05); C10N 2040/255 (2020.05);
Abstract

Proposed is a lubricating oil viscosity index improver containing a liquid alpha-olefin copolymer in which ethylene and an alpha-olefin monomer having 3 or more carbon atoms are copolymerized, wherein the liquid alpha-olefin copolymer is characterized by having a weight average molecular weight (Mw) in the range of 10,000 to 120,000 g/mol, a permanent shear stability index (PSSI) of greater than 1 and less than 25, and a thickening power of greater than 2.5 cSt and less than 3.6 cSt at a temperature of 100° C. In addition, proposed is a lubricating oil composition containing the lubricating oil viscosity index improver.

Find Patent Forward Citations

Ju, Jin. (2026). Lubricating oil viscosity index improver and lubricating oil composition containing the same (U.S. Patent No. 12668757). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12668757

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