Patent US3972822A successfully refreshed from Google Patents.
US3972822A
Expired / Lapsed
US
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Water-insensitive and stable hydraulic fluid compositions
Assignee: Sanyo Chemical Industries Ltd
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Filing: 1974-12-03
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Granted: 1976-08-03
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Expires: 1994-12-03
Abstract
Abstract DOT 4 grade of hydraulic fluid compositions having a stability to hydrolysis is formed from 40 to 65% by weight of a polyglycol monoether, 16 to 45% by weight of a polyglycol and 10 to 19% by weight of a borate ester.
Inventors
- 👤 Teruyuki Sato
- 👤 Motohiko Ii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:56
CPC Classifications
C; C10; C10M; C10M3/00; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/024; C10M2207/026; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/106; C10M2209/107; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/044; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/30; C10M2219/00; C10M2219/09; C10M2227/00; C10M2227/06; C10M2227/061; C10N; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
A hydraulic fluid composition which comprises (A) 40 to 65% by weight, based on the total weight of the fluid composition, of a polyglycol monoether having the formula: R.sub.1 -- OA.sub.1).sub.x OH (1) (wherein R 1 is alkyl having 1 to 4 carbon atoms, A 1 is alkylene having 2 to 4 carbon atoms, and x is 3 to 5); (B) 16 to 45% by weight, based on the total weight of the fluid composition, of a polyglycol having the formula: H -- .sub.2).sub.y OH (2) (wherein A 2 is alkylene having 2 to 4 carbon atoms, and y is 2 to 7); and (C) 10 to 19% by weight, based on the total weight of the fluid composition, of a borate ester of the formula: [R.sub.2 -- OA.sub.3).sub.z O].sub.3 B (3) (wherein R 2 is alkyl having 1 to 4 carbon atoms, A 3 is alkylene having 2 to 4 carbon atoms, z is 3 to 5, and B is the boron atom); wherein the sum of (A) and (B) is more than 80% by weight based on the total weight of the fluid composition.
Claim 2
Dependent Claim
186 words
A hydraulic fluid composition which comprises (A) 40 to 65% by weight, based on the total weight of the fluid composition, of a polyglycol monoether having the formula: R.sub.1 -- OA.sub.1).sub.x OH (1) (wherein R 1 is alkyl having 1 to 4 carbon atoms, A 1 is alkylene having 2 to 4 carbon atoms, and x is 3 to 5); (B) 16 to 45% by weight, based on the total weight of the fluid composition, of a polyglycol having the formula: H -- .sub.2).sub.y OH (2) (wherein A 2 is alkylene having 2 to 4 carbon atoms, and y is 2 to 7); and (C) 10 to 19% by weight, based on the total weight of the fluid composition, of a borate ester of the formula: [R.sub.2 -- OA.sub.3).sub.z O].sub.3 B (3) (wherein R 2 is alkyl having 1 to 4 carbon atoms, A 3 is alkylene having 2 to 4 carbon atoms, z is 3 to 5, and B is the boron atom); wherein the sum of (A) and (B) is more than 80% by weight based on the total weight of the fluid composition.
Claim 3
Dependent Claim
46 words
The hydraulic fluid composition of claim 1, wherein 0-10% by weight, based on the total weight of the fluid composition, of an additional component (D) is incorporated into the fluid composition, selected from the group consisting of antioxidant corrosion inhibitor, pH controlling agent and antifoaming agent.
Claim 4
Dependent Claim
26 words
The hydraulic fluid composition of claim 2, wherein the additional component is at least one member selected from the group consisting of corrosion inhibitors and antioxidants.
Claim 5
Dependent Claim
25 words
The hydraulic fluid composition of claim 1, wherein the components (A), (B) and (C) are present in a weight percent ratio of 40-60; 20-35; 15-19.
Claim 6
Dependent Claim
35 words
The hydraulic fluid composition of claim 1, wherein the polyglycol monoether is at least one member selected from the group consisting of triethylene glycol monomethyl ether, tetraethylene glycol monomethyl ether, and triethylene glycol monobutyl ether.
Claim 7
Dependent Claim
27 words
The hydraulic fluid composition of claim 1, wherein the polyglycol is at least one member selected from the group consisting of polyethylene glycols (molecular weight of 150-300).
Claim 8
Dependent Claim
46 words
The hydraulic fluid compositon of claim 1, wherein the triborate esters of polyglycol monoether is at least one member selected from the group consisting of triborate ester of triethylene glycol monomethylether, triborate ester of tetraethylene glycol monomethyl ether and triborate ester of triethylene glycol monobutyl ether.
Claim 9
Dependent Claim
20 words
The hydraulic fluid composition of claim 2, wherein the additional component (D) is present in an amount of 0.1-5% weight.
References Cited (Backward Citations)
US3711410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |