Patent US3779928A successfully refreshed from Google Patents.
US3779928A
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Automatic transmission fluid
Assignee: Texaco Inc
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Filing: 1969-04-01
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Granted: 1973-12-18
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Expires: 1989-04-01
Abstract
Abstract Automatic transmission fluid comprising at least 86 weight percent of a mineral lubricating oil and 0.01 to 5.0 weight percent of an alkanephosphonic acid salt represented by the formula: IN WHICH R is a straight chain or predominantly straight chain aliphatic radical having from about 11 to 40 carbon atoms, M is zinc, calcium or an alkyl ammonium radical having the formula: IN WHICH R'''' is a polymethylene radical having from two to four carbon atoms, R'' is an alkyl radical having from six to 20 carbon atoms and x is 1 or 2 equal to the valence of M, and a method for operating an automatic transmission.
Inventors
- 👤 R Schlicht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:19
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2203/00; C10M2203/10; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/066; C10M2215/24; C10M2215/26; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/023; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/10; C10M2219/104; C10M2219/108; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10M2223/06; C10M2223/063; C10M2223/065; C10M2225/00; C10M2225/02; C10M2229/00; C10M2229/04; C10M2229/041; C10N; C10N2010/00; C10N2010/04; C10N2040/00; C10N2040/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
A lubricating oil composition for an automatic transmission characterized by substantially reducing the coefficient of friction at the clutch plates at decreasing sliding speeds between the clutch plates and effective to promote smooth shifting comprising at least 86 weight percent of a mineral lubricating oil, from 0.25 to 5.0 weight percent of a dispersant which is the reaction product of a succinic compound and at least one-half equivalent amount of a polyethylene polyamine, said succinic compound being represented by the formula:
Claim 2
Dependent Claim
18 words
A composition according to claim 2 in which the alkyl radical contains from 12 to 18 carbon atoms.
Claim 3
Dependent Claim
18 words
A composition according to claim 2 in which the alkyl radical contains from 12 to 14 carbon atoms.
Claim 4
Dependent Claim
104 words
A composition according to claim 2 in which said mineral lubricating oil comprises 61 percent of a furfural refined, acid-treated, clay-contacted, solvent-dewaxed, paraffin base distillate having an SUS at 100*F. of 100, a viscosity index about 100, a flash above 380*F. and a pour below about +10*F., 9.0 percent of acid-treated naphthenic based distIllate having an SUS at 100*F. of 60, a flash above 300*F. and a pour below -40*F., and 20 percent of a paraffin base residuum which has been propane-deasphalted, centrifuged-dewaxed and clay-treated and has an SUS viscosity at 210*F. of about 160, a flash above 530*F. and a pour of +5*F.
Claim 5
Dependent Claim
14 words
A composition according to claim 2 in which said salt is zinc n-tetradecanephosphonic acid.
Claim 6
Dependent Claim
14 words
A composition according to claim 2 in which said salt is zinc n-octadecanephosphonic acid.
Claim 7
Dependent Claim
20 words
A composition according to claim 2 in which the R in said alkanephosphonic acid salt is an n-C11-C14 alkyl radical.
Claim 8
Dependent Claim
67 words
A composition according to claim 2 containing from 0.5 to 8.0 weight percent of a viscosity index improving polymer of mixed alkyl esters of methacrylic acid having a molecular weight in the range from 25,000 to 1,250,000, from 0.1 to 5 weight percent of (a) an anti-oxidant and corrosion inhibiting zinc dialkylphenoxyalkyl dithiophosphate and from about 0.1 to 2.5 weight percent of an anti-oxidant arylsubstituted alpha naphthylamine.
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |