US4376040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating and regenerating used oil products
Assignee: Individual
•
Filing: 1981-04-28
•
Granted: 1983-03-08
•
Expires: 2001-04-28
Abstract
Abstract In the recovery of regenerated mineral and synthetic oils from blackish dirty lubricating or industrial oils, a quaternary ammonium salt or mixture of salts is added to the dirty oil and the mixture is subjected to agitation. The agitated mixture is next subjected to a decanting operation making it possible to recover, as the upper supernatant fraction, an oil exhibiting approximately the same characteristics as a new starting oil useful for automotive engines, transmissions and differentials, as a lubricant for machine tools, useful in transformers and other electric and electropneumatic devices and also useful as a hydraulic fluid.
Inventors
- 👤 Gabriel Sader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:45
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/0016
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
Process of treating nonedible oil products, particularly used lubricating and industrial oils, to recover a large fraction of directly reusable oil, consisting essentially of: agitating the used oil in the presence of a quaternary ammonium salt containing at least one aryl ring, or a mixture of such salts, and then decanting and recovering the supernatant fraction as a regenerated oil.
Claim 2
Dependent Claim
60 words
Process of treating nonedible oil products, particularly used lubricating and industrial oils, to recover a large fraction of directly reusable oil, consisting essentially of: agitating the used oil in the presence of a quaternary ammonium salt containing at least one aryl ring, or a mixture of such salts, and then decanting and recovering the supernatant fraction as a regenerated oil.
Claim 3
Dependent Claim
26 words
Process according to claim 1 wherein the quaternary ammonium salt is an alkyl dimethylarylammonium halide in which the alkyl radical contains 8 to 18 carbon atoms.
Claim 4
Dependent Claim
55 words
Process according to either claim 1 or 2 wherein the portion of quaternary ammonium salt or mixture of salts varies between 0.1 and 3 parts per 100 parts by weight of used oil, said salt being used in the form of a dilute aqueous solution containing 5 to 30% by weight of quaternary ammonium salt.
Claim 5
Dependent Claim
24 words
Process according to claim 3 wherein the medium of used oil and quaternary ammonium salt is adjusted to a neutral or slightly acid pH.
Claim 6
Dependent Claim
21 words
Process according to claim 4 wherein the agitation is performed at a temperature between normal ambient temperature and about 50° C.
Claim 7
Dependent Claim
27 words
Process according to claim 5 wherein the oils treated are either machine oils, oils drained from vehicles, various industrial oils, hydraulic liquids, or fatty body liquid wastes.
Claim 8
Dependent Claim
46 words
Process according to claim 5 applied to treating acid black muds, which are obtained as residue from the acid regeneration treatment of used oils, wherein the supernatant fraction obtained after decanting is directly reusable as a regenerated oil, after neutralization of the acidity of the oil.
References Cited (Backward Citations)
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Cited
US1469426A
Cited
US4184949A
Cited
US4105538A
Cited
JPS544278A
Cited
US4130674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-07 | 1986-09-06 | 1987-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-07 | 1990-09-06 | 1991-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-07 | 1994-09-06 | 1995-03-08 | $7700.00 | Window Closed / Lapsed |