US3898168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of magnesium carbonate precipitation by water from crankcase oil containing high base magnesium sulfonate
Assignee: BP Corp North America Inc
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Filing: 1972-07-21
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Granted: 1975-08-05
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Expires: 1992-07-21
Abstract
Abstract Crankcase lubricant oil containing high based magnesium sulfonate and zinc dialkyl dithiophosphate antioxidant-antiwear addition agents when contaminated with 1-2 weight percent water tends to precipitate magnesium carbonate particles of a size in the range of 20-60 microns which plug filters having elements of 10-15 micron porosity. By substitution of higher base number magnesium sulfonate and use of small amount of polyether antirust additive with increased zinc dialkyldithio phosphate additive formation of filter plugging magnesium carbonate is prevented.
Inventors
- 👤 Allen Erwin Brehm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:39
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2205/00; C10M2205/02; C10M2205/026; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/08; C10M2215/082; C10M2215/086; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/046; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2040/00; C10N2040/25; C10N2040/251; C10N2040/255; C10N2040/28
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A LUBRICANT OIL COMPOSITION WHICH PREVENTS PRECIPITATION OF MAGNESIUM CARBONATE FROM LUBRICANT OIL FORMULATIONS CONTAMINATED WITH AT LEAST 1 TO 2 WEIGHT PERCENT WATER, WHICH COMPOSITION COMPRISES (A) ESSENTIAL ADDITION AGENTS (1) FROM 0.5 TO 5 WEIGHT PERCENT ASHLESS-TYPE DISPERSANT, (2) FROM 0.07 TO 3.2 WEIGHT PERCENT ZINC DIALKYLDITHIOPHOSPHATE, WHEREIN THE ALKYL GROUPS CONTAIN THREE TO 10 CARBON ATOMS, (3) FROM 0.75 WEIGHT PERCENT OF HIGH BASE MAGNESIUM SULFONATE OF TOTAL BASE NUMBER ABOVE 300, AND (4) 0.05 TO 0.5 WEIGHT PERCENT OF AN ALKYLPHENOXY ETHANOL WHEREIN SAID ALKYL GROUP HAS 6-50 CARBON ATOMS AND THE POLYETHOXY GROUP HAS 3-12 ETHOXY GROUPS, AND (B) LUBRICANT BASE OIL IN AN AMOUNT WITH SAID ADDITIONS TO MAKE 100 WEIGHT PERCENT OF THE LUBRICANT OIL COMPOSITION.
Claim 2
Dependent Claim
123 words
A LUBRICANT OIL COMPOSITION WHICH PREVENTS PRECIPITATION OF MAGNESIUM CARBONATE FROM LUBRICANT OIL FORMULATIONS CONTAMINATED WITH AT LEAST 1 TO 2 WEIGHT PERCENT WATER, WHICH COMPOSITION COMPRISES (A) ESSENTIAL ADDITION AGENTS (1) FROM 0.5 TO 5 WEIGHT PERCENT ASHLESS-TYPE DISPERSANT, (2) FROM 0.07 TO 3.2 WEIGHT PERCENT ZINC DIALKYLDITHIOPHOSPHATE, WHEREIN THE ALKYL GROUPS CONTAIN THREE TO 10 CARBON ATOMS, (3) FROM 0.75 WEIGHT PERCENT OF HIGH BASE MAGNESIUM SULFONATE OF TOTAL BASE NUMBER ABOVE 300, AND (4) 0.05 TO 0.5 WEIGHT PERCENT OF AN ALKYLPHENOXY ETHANOL WHEREIN SAID ALKYL GROUP HAS 6-50 CARBON ATOMS AND THE POLYETHOXY GROUP HAS 3-12 ETHOXY GROUPS, AND (B) LUBRICANT BASE OIL IN AN AMOUNT WITH SAID ADDITIONS TO MAKE 100 WEIGHT PERCENT OF THE LUBRICANT OIL COMPOSITION.
Claim 3
Dependent Claim
15 words
The composition of claim 1 wherein the alkylphenoxy polyethoxy ethanol is an octylphenoxy polyethoxy ethanol.
Claim 4
Dependent Claim
14 words
The composition of claim 1 wherein the alkylphenoxy polyethoxy ethanol is isooctylphenoxy tetraethoxy ethanol.
Claim 5
Dependent Claim
16 words
The composition of claim 3 wherein the magnesium sulfonate has a total base number of 400.
Claim 6
Dependent Claim
35 words
The composition of claim 1 wherein there is present on a weight basis 2.0 percent ashless-type dispersant, 0.96 percent zinc dialkyldithiophosphate, 0.4 percent 400 total base number magnesium sulfonate and 0.1 percent isooctylphenoxy tetraethoxy ethanol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |