US4420407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of lubricating upper cylinder of marine diesel engine
Assignee: Texaco Inc
•
Filing: 1981-10-22
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Granted: 1983-12-13
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Expires: 2001-10-22
Abstract
Abstract A cylinder lubricating oil composition characterized by having a Total Base Number from about 50 to 100 comprising a mineral lubricating oil, from 10 to 20 percent of an overbased calcium sulfonate and an N-hydroxyethyl alkenylsuccinimide represented by the formula: <IMAGE> in which R is a straight chain hydrocarbon radical having form about 8 to 22 carbon atoms.
Inventors
- 👤 Rodney L. Sung
- 👤 Benjamin H. Zoleski
- 👤 William P. Cullen
- 👤 Mahmoud S. Kablaoui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:15
CPC Classifications
C; C10; C10M; C10M163/00; C10M133/00; C10M133/02; C10M133/16; C10M159/00; C10M159/12; C10M159/20; C10M159/24; C10M2205/00; C10M2205/02; C10M2205/024; C10M2205/026; C10M2215/00; C10M2215/08; C10M2215/082; C10M2215/086; C10M2215/12; C10M2215/122; C10M2215/24; C10M2215/28; C10M2219/00; C10M2219/04; C10M2219/046; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/04; C10N2040/042; C10N2040/044; C10N2040/046; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A method for lubricating the upper cylinder zone of a slow speed marine diesel engine wherein the fuel employed is a high sulfur residual fuel oil which continuously generates acidity which comprises injecting into the upper cylinder zone of said engine a lubricating oil composition having a Total Base Number in the range from about 50-100 comprising a mineral lubricating oil, from about 10-20 wt % of an overbased calcium sulfonate having a Total Base Number from about 300-450, and a friction modifying amount of an N-hydroxyethyl alkenylsuccinimide represented by the following formula: ##STR4## in which R is a straight chain hydrocarbon radical having from about 12 to 18 carbon atoms.
Claim 2
Independent Claim
111 words
A method for lubricating the upper cylinder zone of a slow speed marine diesel engine wherein the fuel employed is a high sulfur residual fuel oil which continuously generates acidity which comprises injecting into the upper cylinder zone of said engine a lubricating oil composition having a Total Base Number in the range from about 50-100 comprising a mineral lubricating oil, from about 10-20 wt % of an overbased calcium sulfonate having a Total Base Number from about 300-450, and a friction modifying amount of an N-hydroxyethyl alkenylsuccinimide represented by the following formula: ##STR4## in which R is a straight chain hydrocarbon radical having from about 12 to 18 carbon atoms.
Claim 3
Dependent Claim
18 words
A method according to claim 1 in which the R in said N-hydroxyethyl alkenylsuccinimide is an N-tetradecenyl radical.
Claim 4
Dependent Claim
27 words
A method according to claim 1 containing from about 12 to 18% of an overbased calcium sulfonate having a Total Base Number ranging from 350 to 425.
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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |