US4354949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fluid, hydraulic equipment containing this fluid and a concentrate of this fluid
Assignee: Shell USA Inc
•
Filing: 1981-01-21
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Granted: 1982-10-19
•
Expires: 2001-01-21
Abstract
Abstract Hydraulic fluids consisting of oil in water emulsion comprising 90-99%w of water, non-ionic emulsifier and 0.5-5%w of a high viscosity lubricating oil having a kinematic viscosity of 40 DEG C. of at least 160 cS.
Inventors
- 👤 Carl A. Eggers
- 👤 Gerald D. Galvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:26
CPC Classifications
C; C10; C10M; C10M173/00; C10M2201/00; C10M2201/02; C10M2201/06; C10M2201/062; C10M2201/10; C10M2201/105; C10M2203/00; C10M2203/10; C10M2203/102; C10M2203/108; C10M2205/00; C10M2205/02; C10M2205/026; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/022; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/122; C10M2207/123; C10M2207/125; C10M2207/129; C10M2207/14; C10M2207/141; C10M2207/22; C10M2207/28; C10M2207/287; C10M2207/288; C10M2207/289; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/107; C10M2209/12; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/30; C10M2217/00; C10M2217/02; C10M2217/024; C10M2217/028; C10M2217/06; C10M2219/00; C10M2219/02; C10M2219/10; C10M2219/104; C10M2219/108; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/02; C10N2040/04; C10N2040/042; C10N2040/044; C10N2040/046; C10N2040/08; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50; C10N2050/00; C10N2050/01; C10N2070/00; C10N2070/02
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
48 words
A hydraulic fluid which is an oil-in-water emulsion and comprises from 90-99% w of water, from 0.5-5% w of a lubricating oil with a kinematic viscosity at 40° C. of at least 300 cS, and 10-80% w of the amount of oil of at least one non-ionic emulsifier.
Claim 2
Dependent Claim
48 words
A hydraulic fluid which is an oil-in-water emulsion and comprises from 90-99% w of water, from 0.5-5% w of a lubricating oil with a kinematic viscosity at 40° C. of at least 300 cS, and 10-80% w of the amount of oil of at least one non-ionic emulsifier.
Claim 3
Dependent Claim
27 words
A hydraulic fluid according to claim 1, in which the amount of water is from 94-99% w, and the amount of lubricating oil is from 0.5-4% w.
Claim 4
Dependent Claim
23 words
A hydraulic fluid according to claim 1 in which the lubricating oil comprises residual components of a vacuum distillation of a mineral oil.
Claim 5
Dependent Claim
28 words
A hydraulic fluid according to any one of the preceding claims in which the lubricating oil has a kinematic viscosity at 40° C. of at least 400 cS.
Claim 6
Dependent Claim
33 words
A hydraulic fluid according to claim 1, in which said non-ionic emulsifier consists of a condensation product of one or more alkylene oxides with one or more compounds with a reactive hydrogen atom.
Claim 7
Dependent Claim
29 words
A hydraulic fluid according to claim 5, in which the alkylene oxides are ethylene oxide and/or propylene oxide, and the compounds with a reactive hydrogen atom are carboxylic acids.
Claim 8
Dependent Claim
49 words
A hydraulic fluid according to claim 6, in which the emulsifier contains one type of polymeric component which is derived from an oil-soluble complex mono-carboxylic acid (polymeric component A) and another type of polymeric component which is the residue of a water-soluble compound containing polyoxyalkylene chains (polymeric component B).
Claim 9
Dependent Claim
51 words
A hydraulic fluid according to claim 7, in which the polymeric component A has a molecular weight of at least 500 and consists of a poly-(12-hydroxystearic acid) chain terminated with stearic acid, and the polymeric component B has a molecular weight of at least 500 and is derived from ethylene oxide.
Claim 10
Dependent Claim
32 words
A hydraulic fluid according to claim 7, in which in the emulsifier each of the hydroxyl groups present in polymeric component B has been esterified with a molecule of polymeric component A.
Claim 11
Dependent Claim
17 words
A hydraulic fluid according to claim 1 which contains a non-ionic emulsifier with molecular weight below 1000.
Claim 12
Dependent Claim
14 words
A hydraulic fluid according to claim 1 which comprises at least one anti-pitting additive.
Claim 13
Dependent Claim
15 words
A hydraulic fluid according to claim 11 in which the anti-pitting additive is N-isopropyl ethanolamine.
Claim 14
Dependent Claim
26 words
A hydraulic fluid according to claim 11 in which the amount of the anti-pitting additive is from 0.1-30% w of the amount of lubricating oil present.
Claim 15
Dependent Claim
14 words
A hydraulic fluid according to claim 1 which comprises at least one anti-rust additive.
Claim 16
Dependent Claim
16 words
A hydraulic fluid according to claim 14 which comprises di-ethanolamine and/or tri-ethanolamine as an anti-rust additive.
Claim 17
Dependent Claim
18 words
A hydraulic fluid according to claim 14 which comprises an overbased calcium salt of an alkyl salicylic acid.
Claim 18
Dependent Claim
26 words
A hydraulic fluid according to claim 14, in which the total amount of anti-rust additives is from 0.5-10% w of the amount of lubricating oil present.
Claim 19
Dependent Claim
21 words
A hydraulic fluid according to claims 12 or 15 comprising an acid in up to stoichiometric quantities of alkanol amine present.
Claim 20
Dependent Claim
15 words
A hydraulic fluid according to claim 18, wherein the acid is an alkenyl succinic anhydride.
Claim 21
Dependent Claim
12 words
A hydraulic fluid according to claim 1 comprising a thickened water phase.
Claim 22
Dependent Claim
35 words
A concentrate of a hydraulic fluid which contains 0-90% w water, 91-9.0% w of a lubricating oil having kinematic viscosity at 40° C. of at least 300 cS and 50-1.0% w of a non-ionic emulsifier.
Claim 23
Dependent Claim
35 words
A concentrate of a hydraulic fluid which contains 0-90% w water, 91-9.0% w of a lubricating oil having kinematic viscosity at 40° C. of at least 300 cS and 50-1.0% w of a non-ionic emulsifier.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |