US3957667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic oil composition
Assignee: NOF Corp
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Filing: 1974-12-23
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Granted: 1976-05-18
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Expires: 1994-12-23
Abstract
Abstract A hydraulic oil composition for automobile, comprising low molecular weight polyoxyalkylene glycol monoalkyl ether and dialkyl ether and a high molecular weight polyoxyalkylene compound. The hydraulic oil composition has improved low temperature viscosity characteristics and fluidity and has a low swelling action on rubber.
Inventors
- 👤 Yoshiharu Tanizaki
- 👤 Hiroshi Kawaguchi
- 👤 Kenichiro Minagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:34
CPC Classifications
C; C10; C10M; C10M3/00; C07; C07C; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/10; C07C43/11; C07C43/13; C07C43/135; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/321; C08G65/329; C08G65/331; C08G65/3311; C08G65/3312; C08L; C08L71/00; C08L71/02; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/106; C10M2209/107; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/06; C10M2215/064; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/30; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
A hydraulic oil composition comprising 100 parts by weight of a mixture of 60-98% by weight of a polyoxyalkylene glycol monoalkyl ether having the following general formula (1) and 2-40% by weight of at least one of polyoxyalkylene glycol dialkyl ethers having the following general formulae (2) and (3), R.sup.1 O(C.sub.m H.sub.2m O).sub.n H, (1) r.sup.1 o(c.sub.m H.sub.2m O).sub.n R.sup.2 ( 2) and [R.sup.1 O(C.sub.m H.sub.2m O).sub.n ].sub.2 CH.sub.2 ( 3) wherein R 1 and R 2 represent alkyl groups having 1-3 carbon atoms respectively, C m H 2m O represents an oxyalkylene group, m represents a positive integer of 2, 3 or 4, and n represents a positive integer of 2-6, the oxyethylene content in the total oxyalkylene of compounds (1), (2) and (3) being 40-90% by weight, and 2-40 parts by weight of a high molecular weight polyoxyalkylene compound having a kinematic viscosity of at least 8 cst at 210°F and having not less than 90% by weight of polyoxyalkylene glycol in the molecule and 15-80% by
Claim 2
Dependent Claim
169 words
A hydraulic oil composition comprising 100 parts by weight of a mixture of 60-98% by weight of a polyoxyalkylene glycol monoalkyl ether having the following general formula (1) and 2-40% by weight of at least one of polyoxyalkylene glycol dialkyl ethers having the following general formulae (2) and (3), R.sup.1 O(C.sub.m H.sub.2m O).sub.n H, (1) r.sup.1 o(c.sub.m H.sub.2m O).sub.n R.sup.2 ( 2) and [R.sup.1 O(C.sub.m H.sub.2m O).sub.n ].sub.2 CH.sub.2 ( 3) wherein R 1 and R 2 represent alkyl groups having 1-3 carbon atoms respectively, C m H 2m O represents an oxyalkylene group, m represents a positive integer of 2, 3 or 4, and n represents a positive integer of 2-6, the oxyethylene content in the total oxyalkylene of compounds (1), (2) and (3) being 40-90% by weight, and 2-40 parts by weight of a high molecular weight polyoxyalkylene compound having a kinematic viscosity of at least 8 cst at 210°F and having not less than 90% by weight of polyoxyalkylene glycol in the molecule and 15-80% by
Claim 3
Dependent Claim
20 words
A hydraulic oil composition according to claim 1, wherein said high molecular weight polyoxyalkylene compound has a kinematic viscosity of
Claim 4
Dependent Claim
21 words
A hydraulic oil composition according to claim 1, wherein said high molecular weight polyoxyalkylene compound has a solidifying point of not
Claim 5
Dependent Claim
29 words
A hydraulic oil composition according to claim 1, wherein said high molecular weight polyoxyalkylene compound has 45-60% by weight of oxyethylene based on the total oxyalkylene in the molecule.
References Cited (Backward Citations)
US2520611A
Cited
US3062747A
Cited
US3287274A
Cited
US3346501A
Cited
US3329614A
Cited
US3472781A
Cited
US3528920A
Cited
US3629111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |