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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 11155767 B1

PDFFull Text
Date of Patent:
Oct. 26, 2021

Filed:

Aug. 28, 2017

Vacuum pump oil

Applicant:

Idemitsu Kosan Co., Ltd., Chiyoda-ku, JP;

Inventor:

Tokue Sato, Ichihara, JP;

Assignee:

IDEMITSU KOSAN CO., LTD., Chiyoda-ku, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Vishal V Vasisth

Int. Cl.
CPC ...
C10M 169/04 (2006.01); C10M 101/02 (2006.01); C10M 133/12 (2006.01); C10M 129/10 (2006.01); C10M 129/70 (2006.01); C10M 141/06 (2006.01); C10N 20/02 (2006.01); C10N 30/02 (2006.01); C10N 30/00 (2006.01); C10N 40/30 (2006.01);
U.S. Cl.
CPC ...
C10M 169/04 (2013.01); C10M 101/02 (2013.01); C10M 129/10 (2013.01); C10M 129/70 (2013.01); C10M 133/12 (2013.01); C10M 141/06 (2013.01); C10M 2203/1025 (2013.01); C10M 2207/284 (2013.01); C10M 2215/26 (2013.01); C10N 2020/02 (2013.01); C10N 2030/02 (2013.01); C10N 2030/40 (2020.05); C10N 2040/30 (2013.01);
Abstract

Provided is a vacuum pump oil which contains a mineral oil (A) having a temperature gradient Δ|η*| of complex viscosity between two points of t(° C.) and t−10(° C.) (where −15≤t≤−10), as measured using a rotary rheometer at an angular velocity of 6.3 rad/s, of 10 Pa·s/° C. or less, and one or more compounds selected from a phenol-based compound (B) and an amine-based compound (C), and which has a viscosity index of less than 160. The vacuum pump oil has a good ultimate vacuum degree and is excellent in water separability, oxidation stability and shear stability, and is therefore applicable to various applications.

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