Patent US4844827A successfully refreshed from Google Patents.
US4844827A
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Lubricating oil additive
Assignee: Ethyl Corp
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Filing: 1988-11-09
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Granted: 1989-07-04
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Expires: 2008-11-09
Abstract
Abstract A highly dispersant lubricating oil additive having a relatively low nitrogen content is provided by reacting a solvent free bis(primary amine) composition with an aliphatic hydrocarbon-substituted succinimic anhydride or with an admixture of an aliphatic hydrocarbon-substituted phenol, formaldehyde, and a fatty acid.
Inventors
- 👤 John G. Schaffhausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:44
CPC Classifications
C; C10; C10M; C10M159/00; C10M159/12; C10M159/16; C10M133/00; C10M133/52; C10M2201/00; C10M2201/087; C10M2205/00; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/086; C10M2215/24; C10M2215/28; C10M2217/00; C10M2217/04; C10M2217/042; C10M2217/043; C10M2219/00; C10M2219/04; C10M2219/044; C10M2219/046; C10N; C10N2040/00; C10N2040/25; C10N2040/251; C10N2040/255; C10N2040/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A dispersant lubricating oil additive having a relatively low nitrogen content which is the reaction product obtained upon reacting a bis primary amine composition free from secondary amines with an admixture comprising an aliphatic hydrocarbon-substituted phenol and formaldehyde at an equivalents ratio of amine:phenol:formaldehyde of about 0.7-1:1:1.5-2.2, where the bis primary amine composition comprises bis(p-aminocyclohexyl) methane, isomers thereof, and three-and four-ring analogs thereof.
Claim 2
Dependent Claim
63 words
A dispersant lubricating oil additive having a relatively low nitrogen content which is the reaction product obtained upon reacting a bis primary amine composition free from secondary amines with an admixture comprising an aliphatic hydrocarbon-substituted phenol and formaldehyde at an equivalents ratio of amine:phenol:formaldehyde of about 0.7-1:1:1.5-2.2, where the bis primary amine composition comprises bis(p-aminocyclohexyl) methane, isomers thereof, and three-and four-ring analogs thereof.
Claim 3
Dependent Claim
79 words
The dispersant lubricating oil additive in accordance with claim 1 wherein said bis(primary amine) composition contains bis(p-aminocyclohexyl)methane in an amount of about 16 to about 23 percent by weight, methylene bis-aniline in an amount of about 1 to about 5 percent by weight, isomers of bis(p-aminocyclohexyl)methane in an amount of about 4 to about 13 percent by weight, and analogs of bis(p-aminocyclohexyl)methane containing three and four rings in an amount of about 48 to about 62 percent by weight.
Claim 4
Dependent Claim
17 words
The dispersant lubricating oil additive accordance with claim 1 wherein the aliphatic hydrocarbon-substituted phenol is polybutyl phenol.
Claim 5
Dependent Claim
23 words
The dispersant lubricating oil additive of claim 1 wherein said admixture of aliphatic hydrocarbon substituted phenol and formaldehyde further comprises a fatty acid.
Claim 6
Dependent Claim
9 words
A lubricating oil comprising the additive of claim 1.
References Cited (Backward Citations)
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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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |