Patent US3972853A successfully refreshed from Google Patents.
US3972853A
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Process for stabilizing lubricating oil with elemental sulfur
Assignee: Mobil Oil AS
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Filing: 1974-08-08
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Granted: 1976-08-03
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Expires: 1994-08-08
Abstract
Abstract A stabilized lubricating oil resistant to oxidation and sludge formation upon exposure to an oxidative environment is prepared without forming undesirable color bodies therein by contacting the lubricating oil stock with a small amount of elemental sulfur of from about 0.1 to about 0.5 percent by weight at a contact temperature of from about 25 DEG C to about 70 DEG C and, thereafter, removing any unreacted sulfur therefrom.
Inventors
- 👤 Robert L. Gorring
- 👤 Eric J. Y. Scott
- 👤 Robert L. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:35
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10G; C10G29/00; C10G29/02; C10M2201/00; C10M2201/04; C10M2201/043; C10M2219/00; C10M2219/08; C10M2219/082
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A process for forming a stablized lubricating oil resistant to oxidation and sludge formation upon exposure to an oxidative environment which comprises contacting a hydrocarbon lubricating oil stock having a boiling range above about 600° F with elemental sulfur in amount of from about 0.1 to about 0.5 percent by weight of said oil stock at a reaction temperature of between about 25° C and about 70°C and reaction pressure of from about 0 psig to about 100 psig for a reaction period of at least 2 hours, and, washing the oil from said contacting step to remove any unreacted sulfur therefrom.
Claim 2
Dependent Claim
102 words
A process for forming a stablized lubricating oil resistant to oxidation and sludge formation upon exposure to an oxidative environment which comprises contacting a hydrocarbon lubricating oil stock having a boiling range above about 600° F with elemental sulfur in amount of from about 0.1 to about 0.5 percent by weight of said oil stock at a reaction temperature of between about 25° C and about 70°C and reaction pressure of from about 0 psig to about 100 psig for a reaction period of at least 2 hours, and, washing the oil from said contacting step to remove any unreacted sulfur therefrom.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein said oil stock comprises a lubricating oil fraction obtained by fractionation of a crude oil identified as Pennsylvania, Midcontinent, Gulf Coast, West Texas, Amal, Kuwait, Barco or Arabian.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein said oil stock is a lubricating oil fraction obtained by fractionation of crude oil identified as Arabian.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein said elemental sulfur is crystalline.
Claim 6
Dependent Claim
18 words
The process of claim 4 wherein said crystalline sulfur is obtained by recrystallization of sublimed sulfur from toluene.
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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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |