US3984339A
Expired / Lapsed
US
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Hydraulic oil composition
Assignee: FMC Corp
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Filing: 1973-10-05
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Granted: 1976-10-05
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Expires: 1993-10-05
Abstract
Abstract A hydraulic oil composition having a large Winslow effect containing an electrical insulating oil, a water-soluble electrolyte, a liquid having a high dielectric constant, and microcrystalline cellulose particles.
Inventors
- 👤 Kimihiko Takeo
- 👤 Yukikazu Omura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:30
CPC Classifications
C; C10; C10M; C10M171/00; C10M171/001; C10M2201/00; C10M2201/02; C10M2201/08; C10M2201/081; C10M2201/082; C10M2201/084; C10M2205/00; C10M2205/22; C10M2207/00; C10M2207/02; C10M2207/021; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/122; C10M2207/123; C10M2207/125; C10M2207/129; C10M2207/22; C10M2207/28; C10M2207/282; C10M2207/34; C10M2209/00; C10M2209/12; C10M2211/00; C10M2211/02; C10M2211/024; C10M2211/06; C10M2215/00; C10M2215/08; C10M2215/082; C10M2215/24; C10M2215/28; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2010/00; C10N2010/02; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A hydraulic oil composition having a large Winslow effect comprised of an electrical insulating oil (A), a water-soluble electrolyte (B), a liquid (C) selected from the group consisting of water, formamide, methyl alcohol and ethyl alcohol, and microcrystalline cellulose particles (D), said constituents A, B, C and D being present, in parts by weight, in accordance with formulas, as follows: ##EQU3##
Claim 2
Dependent Claim
61 words
A hydraulic oil composition having a large Winslow effect comprised of an electrical insulating oil (A), a water-soluble electrolyte (B), a liquid (C) selected from the group consisting of water, formamide, methyl alcohol and ethyl alcohol, and microcrystalline cellulose particles (D), said constituents A, B, C and D being present, in parts by weight, in accordance with formulas, as follows: ##EQU3##
Claim 3
Dependent Claim
19 words
A hydraulic oil composition as defined in claim 1 wherein the formula (a) of B/D = 0.0005 - 0.005.
Claim 4
Dependent Claim
23 words
A hydraulic oil composition as defined in claim 1 wherein the microcrystalline cellulose particles (D) have dimensions of from 0.2 to 50 microns.
Claim 5
Dependent Claim
22 words
A hydraulic oil composition as defined in claim 3 wherein the microcrystalline cellulose particles have dimensions ranging from 0.5 to 10 microns.
Claim 6
Dependent Claim
27 words
A hydraulic oil composition as defined in claim 1 wherein the electrical insulating oil (A) is one having a chemically stable viscosity of 2-300 centipoise at 25°C.
Claim 7
Dependent Claim
20 words
A hydraulic oil composition as defined in claim 1 wherein the liquid (C) having a high dielectric constant is water.
Claim 8
Dependent Claim
23 words
A hydraulic oil composition as defined in claim 2 wherein the microcrystalline cellulose particles (D) have dimensions ranging from 0.5 to 10 microns.
Claim 9
Dependent Claim
27 words
A hydraulic oil composition as defined in claim 7 wherein the electrical insulating oil (A) is one having a chemically stable viscosity of 2-300 centipoise at 25°C.
Claim 10
Dependent Claim
20 words
A hydraulic oil composition as defined in claim 7 wherein the liquid (C) having a high dielectric constant is water.
Claim 11
Dependent Claim
19 words
A hydraulic oil composition defined in claim 8 wherein the liquid (C) having a high dielectric constant is water.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |