Patent US4486324A successfully refreshed from Google Patents.
US4486324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fluids
Assignee: EDWIN COOPER Inc A CORP OF
•
Filing: 1981-11-06
•
Granted: 1984-12-04
•
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 20:13
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.
References Cited (Backward Citations)
US3024198A
Cited
US3219666A
Cited
US3231587A
Cited
US3255108A
Cited
US3269946A
Cited
US3216936A
Cited
US3489682A
Cited
US4219434A
Cited
US4118331A
Cited
US4257902A
Cited
GB2032951A
Cited
US4225447A
Cited
US4354949A
Cited
US4313836A
Cited
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 |