Global Patent Index - EP 0992570 A2

EP 0992570 A2 2000-04-12 - Hydraulic oil composition for shock absorbers

Title (en)

Hydraulic oil composition for shock absorbers

Title (de)

Hydraulisches Öl für Stossdämpfer

Title (fr)

Huile hydraulique pour amortisseurs

Publication

EP 0992570 A2 (EN)

Application

EP 99307976 A

Priority

JP 28795898 A

Abstract (en)

The present invention provides a hydraulic oil composition comprising a base oil composed of a mineral oil (A) and/or synthetic oil (B) incorporated with 20 wt% or less, based on the whole composition, of one or more types of additives (C) including viscosity index improver and/or pour point depressant, and having a kinematic viscosity of 1 to 20 mm<2>/s at 100 DEG C, a viscosity index of 140 or more and a Brookfield viscosity of 2000 mPas or less at -40 DEG C, wherein the mineral oil (A) is a deeply dewaxed mineral oil (a) having a kinematic viscosity of 2 to 3 mm<2>/s at 100 DEG C, pour point of -30 DEG C or less and cloud point of -27.5 DEG C or less, or a mixed mineral oil of the deeply dewaxed mineral oil (a) and a low-viscosity mineral oil (b) having a kinematic viscosity of 1.0 to 6.0 mm<2>/s at 40 DEG C, and the synthetic oil (B) is a poly- alpha -olefin (c) having a kinematic viscosity of 1.5 to 45 mm<2>/s at 100 DEG C, and/or an ester compound (d) having a kinematic viscosity of 1.5 to 20 mm<2>/s at 100 DEG C and pour point of -30 DEG C or less.

IPC 1-7 (main, further and additional classification)

C10M 169/04; C10M 101/02; C10M 105/38; C10M 107/10; C10M 111/02; C10M 111/04

IPC 8 full level (invention and additional information)

C10M 101/02 (2006.01); C10M 105/38 (2006.01); C10M 107/10 (2006.01); C10M 111/02 (2006.01); C10M 111/04 (2006.01); C10M 169/04 (2006.01); C10N 30/02 (2006.01); C10N 30/06 (2006.01); C10N 30/08 (2006.01); C10N 40/08 (2006.01)

CPC (invention and additional information)

C10M 111/02 (2013.01); C10M 101/02 (2013.01); C10M 105/38 (2013.01); C10M 107/10 (2013.01); C10M 111/04 (2013.01); C10M 169/041 (2013.01); C10M 2203/10 (2013.01); C10M 2203/1006 (2013.01); C10M 2203/102 (2013.01); C10M 2203/1025 (2013.01); C10M 2203/1045 (2013.01); C10M 2203/1065 (2013.01); C10M 2203/1085 (2013.01); C10M 2205/00 (2013.01); C10M 2205/02 (2013.01); C10M 2205/028 (2013.01); C10M 2205/0285 (2013.01); C10M 2207/2825 (2013.01); C10M 2207/2835 (2013.01); C10M 2207/2855 (2013.01); C10M 2209/084 (2013.01); C10N 2240/06 (2013.01)

Combination set (CPC)

C10M 169/041 + C10M 101/02 + C10M 105/36 + C10M 105/38 + C10M 107/10 + C10M 143/00 + C10M 145/14

Designated contracting state (EPC)

BE DE FR GB IT NL

EPO simple patent family

EP 0992570 A2 20000412; EP 0992570 A3 20000830; CA 2284343 A1 20000409; JP 2000109876 A 20000418; SG 108213 A1 20050128

INPADOC legal status


2002-01-23 [18D] DEEMED TO BE WITHDRAWN

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2001-04-25 [17Q] FIRST EXAMINATION REPORT

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2000-11-29 [17P] REQUEST FOR EXAMINATION FILED

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2000-04-12 [AK] DESIGNATED CONTRACTING STATES:

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