US4486324A
Expired / Lapsed
US
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Hydraulic fluids
Assignee: EDWIN COOPER Inc A CORP OF
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Filing: 1981-11-06
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Granted: 1984-12-04
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Expires: 2001-11-06
Abstract
Abstract An aqueous hydraulic fluid comprising at least 80 percent water and containing a hydrocarbyl-substituted succinic acid, a zinc dihydrocarbyl dithiophosphate, a hydroxyalkylamine, sodium alkylbenzene sulfonate, and optionally, a polyalkylene glycol mono-fatty acid ester.
Inventors
- 👤 Philip S. Korosec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:06
CPC Classifications
C; C10; C10M; C10M173/00; C10M173/02; C10M129/00; C10M129/86; C10M129/92; C10M129/93; C10M133/00; C10M133/02; C10M133/04; C10M133/06; C10M133/08; C10M135/00; C10M135/08; C10M135/10; C10M137/00; C10M137/02; C10M137/04; C10M137/10; C10M145/00; C10M145/18; C10M145/24; C10M145/26; C10M145/36; C10M2201/00; C10M2201/02; C10M2207/00; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/123; C10M2207/129; C10M2207/22; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/107; C10M2209/108; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2219/00; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2050/00; C10N2050/01
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
65 words
A substantially oil free aqueous hydraulic fluid comprising (a) at least 80 weight percent water, (b) about 0.1-5 weight percent of a polyisobutenyl substituted succinic acid said polyisobutenyl substituent having a molecular weight of 700-5000, (c) about 0.1-5 weight percent of a zinc dihydrocarbyl dithiophosphate, (d) about 0.05-5 weight percent of a hydroxyalkyl amine, and (e) about 0.1-5 weight percent of a sodium alkylbenzene sulfonate.
Claim 2
Dependent Claim
65 words
A substantially oil free aqueous hydraulic fluid comprising (a) at least 80 weight percent water, (b) about 0.1-5 weight percent of a polyisobutenyl substituted succinic acid said polyisobutenyl substituent having a molecular weight of 700-5000, (c) about 0.1-5 weight percent of a zinc dihydrocarbyl dithiophosphate, (d) about 0.05-5 weight percent of a hydroxyalkyl amine, and (e) about 0.1-5 weight percent of a sodium alkylbenzene sulfonate.
Claim 3
Dependent Claim
20 words
A hydraulic fluid of claim 1 wherein said zinc dihydrocarbyl dithiophosphate is a zinc di-C 3 - 12 alkyl dithiophosphate.
Claim 4
Dependent Claim
25 words
A hydraulic fluid of claim 2 wherein said hydroxyalkylamine is selected from the group consisting of hydroxyethylamines, hydroxypropyl amines, hydroxyethyl hydroxypropyl amines and mixtures thereof.
Claim 5
Dependent Claim
68 words
A hydraulic fluid of claim 3 comprising (a) at least 80 weight percent water, (b) about 0.1-5 weight percent polybutene substituted succinic acid wherein said polybutene substituent has a molecular weight of about 700-5000, (c) about 0.1-5 weight percent of a zinc di-C 3 - 12 alkyl dithiophosphate, (d) about 0.05-5 weight percent of a hydroxyethyl amine and (e) about 0.1-5 weight percent of a sodium alkylbenzene sulfonate.
Claim 6
Dependent Claim
56 words
A hydraulic fluid of claim 4 comprising (a) at least 90 weight percent water, (b) about 0.1-3 weight percent of said polybutene substituted succinic acid, (c) about 0.1-3 weight percent of a zinc di-C 4 - 8 alkyl dithiophosphate, (d) about 0.1-3 weight percent of diethanolamine and (e) about 0.1-3 weight percent of sodium alkylbenzene sulfonate.
Claim 7
Dependent Claim
14 words
A hydraulic fluid of claim 1 further characterized by containing a polyalkylene glycol monooleate.
Claim 8
Dependent Claim
19 words
A hydraulic fluid of claim 5 further characterized by containing about 0.5-3 weight percent of a polyethylene glycol monooleate.
Claim 9
Dependent Claim
79 words
A hydraulic fluid concentrate adapted for addition to water to form a substantially oil free aqueous hydraulic fluid, said concentrate consisting essentially of (a) from about 0-20 weight percent water, (b) about 20-50 weight percent of a polyisobutenyl-substituted succinic acid said polyisobutenyl substituent having a molecular weight of 700-5000, (c) about 10-30 weight percent of a zinc dihydrocarbyl dithiophosphate, (d) about 3-12 weight percent of a hydroxyalkyl amine and (e) about 5-15 weight percent of a sodium alkylbenzene sulfonate.
Claim 10
Dependent Claim
79 words
A hydraulic fluid concentrate adapted for addition to water to form a substantially oil free aqueous hydraulic fluid, said concentrate consisting essentially of (a) from about 0-20 weight percent water, (b) about 20-50 weight percent of a polyisobutenyl-substituted succinic acid said polyisobutenyl substituent having a molecular weight of 700-5000, (c) about 10-30 weight percent of a zinc dihydrocarbyl dithiophosphate, (d) about 3-12 weight percent of a hydroxyalkyl amine and (e) about 5-15 weight percent of a sodium alkylbenzene sulfonate.
Claim 11
Dependent Claim
19 words
A concentrate of claim 8 wherein said zinc dihydrocarbyl dithiophosphate is a zinc di-C 3 - 12 alkyl dithiophosphate.
Claim 12
Dependent Claim
26 words
A concentrate of claim 9 wherein said hydroxyalkyl amine is selected from the group consisting of hydroxyethyl amines, hydroxypropyl amines, hydroxyethyl hydroxypropyl amines, and mixtures thereof.
Claim 13
Dependent Claim
56 words
A concentrate of claim 10 comprising (a) 0-20 weight percent water, (b) about 20-50 weight percent of said polybutene substituted succinic acid, (c) about 10-30 weight percent of said zinc di-C 3 - 12 alkyl dithiophosphate, (d) about 3-12 weight percent of a hydroxyethyl amine and (e) about 5-15 weight percent of a sodium alkylbenzene sulfonate.
Claim 14
Dependent Claim
54 words
A concentrate of claim 11 comprising (a) about 5-15 weight percent water, (b) about 30-50 weight percent of said polybutene substituted succinic acid, (c) about 15-25 weight percent of a zinc di-C 4 - 8 alkyldithiophosphate, (d) about 3-10 weight percent of diethanol amine and (e) about 5-15 weight percent of sodium alkylbenzene sulfonate.
Claim 15
Dependent Claim
17 words
A concentrate of claim 8 further characterized by containing 0.25 weight percent of a polyalkylene glycol monooleate.
Claim 16
Dependent Claim
18 words
A concentrate of claim 12 further characterized by containing about 10-20 weight percent of a polyethylene glycol monooleate.
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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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |