US3772197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricating oil composition
Assignee: Citgo Petroleum Corp
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Filing: 1970-12-04
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Granted: 1973-11-13
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Expires: 1990-12-04
Abstract
Abstract Antioxidant additives for lubricating oils and lubricating oil compositions containing said antioxidant additives. The stability of lubricating oil compositions toward oxidizing conditions is markedly improved when an antioxidant additive comprising a mixture of a metal dialkyldithiocarbamate and a Group IIa metal sulfonate is incorporated therein. The preferred additives comprise mixtures of cadmium diamyldithiocarbamate or antimony dialkyldithiocarbamate with a barium sulfonate or a calcium sulfonate.
Inventors
- 👤 D Milsom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:59
CPC Classifications
C; C10; C10M; C10M135/00; C10M2219/00; C10M2219/04; C10M2219/044; C10M2219/06; C10M2219/062; C10M2219/066; C10M2219/068; C10N; C10N2010/00; C10N2010/04; C10N2010/08; C10N2010/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
23 words
The antioxidant of claim 1 wherein the metal associated with the dialkyldithiocarbamate is selected from the group consisting of zinc, cadmium, and antimony.
Claim 2
Dependent Claim
20 words
The antioxidant of claim 2 wherein each alkyl group of the metal dialkyldithiocarbamate contains about three to about 10 carbons.
Claim 3
Dependent Claim
25 words
The antioxidant of claim 3 wherein the Group IIa metal associated with the oil-soluble sulfonate is selected from the group consisting of barium and calcium.
Claim 4
Dependent Claim
56 words
The antioxidant of claim 4 wherein said metal dialkyldithiocarbamate consists of cadmium diamyldithiocarbamate, said Group IIa metal sulfonate consists of an oil-soluble barium sulfonate containing sufficient barium carbonate to give a base number of about 65, and the weight ratio of said oil-soluble barium sulfonate to said cadmium diamyldithiocarbamate is from about 0.5:1 to about 2.5:1.
Claim 5
Dependent Claim
56 words
The antioxidant of claim 4 wherein said metal dialkyldithiocarbamate consists of cadmium diamyldithiocarbamate, said Group IIa metal sulfonate consists of an oil-soluble calcium sulfonate containing sufficient calcium carbonate to give a base number of about 300, and the weight ratio of said oil-soluble calcium sulfonate to said cadmium diamyldithiocarbamate is from about 0.5:1 to about 1.5:1.
Claim 6
Dependent Claim
53 words
The antioxidant of claim 4 wherein said metal dialkyldithiocarbamate consists of an antimony dialkyldithiocarbamate, said Group IIa metal sulfonate consists of an oil-soluble barium sulfonate containing sufficient barium carbonate to give a base number of about 65, and the weight ratio of said oil-soluble barium sulfonate to said antimony dialkyldithiocarbamate is about 1:1.
Claim 7
Dependent Claim
39 words
A hydrocarbon lubricating oil composition consisting essentially of a major proportion of a hydrocarbon lubricating oil and about 0.6 percent to about 1.5 percent by weight, based on said hydrocarbon lubricating oil composition, of the additive of claim 5.
Claim 8
Dependent Claim
39 words
A hydrocarbon lubricating oil composition consisting essentially of a major proportion of a hydrocarbon lubricating oil and about 0.6 percent to about 1.0 percent by weight, based on said hydrocarbon lubricating oil composition, of the additive of claim 6.
Claim 9
Dependent Claim
75 words
A hydrocarbon lubricating oil composition consisting essentially of a major proportion of a hydrocarbon lubricating oil, about 0.4 percent by weight of said hydrocarbon lubricating oil composition of cadmium diamyldithiocarbamate, and about 1.0 percent by weight of said hydrocarbon lubricating oil composition of a mixture containing about 42 weight percent hydrocarbon oil, about 47 weight percent of an oil-soluble barium sulfonate, and sufficient barium carbonate to give said mixture a base number of about 65.
Claim 10
Dependent Claim
75 words
A hydrocarbon lubricating oil composition consisting essentially of a major proportion of a hydrocarbon lubricating oil, about 0.4 percent by weight of said hydrocarbon lubricating oil composition of cadmium diamyldithiocarbamate, and about 1.0 percent by weight of said hydrocarbon lubricating oil composition of a mixture containing about 47 weight percent hydrocarbon oil, about 30 weight percent of an oil-soluble calcium sulfonate, and sufficient calcium carbonate to give said mixture a base number of about 300.
Claim 11
Dependent Claim
39 words
A hydrocarbon lubricating oil composition consisting essentially of a major proportion of a hydrocarbon lubricating oil and about 0.5 percent to about 3.0 percent by weight, based on said hydrocarbon lubricating oil composition, of the additive of claim 1.
Claim 12
Dependent Claim
39 words
A hydrocarbon lubricating oil composition consisting essentially of a major proportion of a hydrocarbon lubricating oil and about 0.6 percent to about 2.0 percent by weight; based on said hydrocarbon lubricating oil composition, of the additive of claim 4.
References Cited (Backward Citations)
US2450633A
Cited
US2504672A
Cited
US3155617A
Cited
US3488722A
Cited
US3462367A
Cited
US3412026A
Cited
US3630897A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |