US4036770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of hydrocracked oils with amino nitrophenols
Assignee: Mobil Oil AS
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Filing: 1975-10-17
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Granted: 1977-07-19
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Expires: 1995-10-17
Abstract
Abstract Hydrocracked oils are stabilized against deterioration due to exposure to light and/or air by adding to them a small amount of aromatic amine having a nitro group, the amino and nitro groups being ortho or para to each other.
Inventors
- 👤 Wilton F. Espenscheid
- 👤 Robert D. Offenhauer
- 👤 Tsoung Y. Yan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:45
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/20; C10M2215/202
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
A method of stabilizing a hydrocracked lubricating oil from deterioration caused by light and air comprising adding to said oil a stabilizing amount of a compound of the formula: ##STR3## wherein Ar is phenyl or diphenyl, R is the same or different and is selected from the group consisting of phenyl, hydrogen and alkyl containing from 1 to 18 carbon atoms and R' is hydrogen or an alkyl containing from 1 to 18 carbon atoms, and wherein the R 2 N and N0 2 groups are ortho or para to each other.
Claim 2
Independent Claim
92 words
A method of stabilizing a hydrocracked lubricating oil from deterioration caused by light and air comprising adding to said oil a stabilizing amount of a compound of the formula: ##STR3## wherein Ar is phenyl or diphenyl, R is the same or different and is selected from the group consisting of phenyl, hydrogen and alkyl containing from 1 to 18 carbon atoms and R' is hydrogen or an alkyl containing from 1 to 18 carbon atoms, and wherein the R 2 N and N0 2 groups are ortho or para to each other.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the NR 2 and N0 2 groups are ortho to each other.
Claim 4
Dependent Claim
18 words
The method of claim 1 wherein the NR 2 and N0 2 groups are para to each other.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein the compound is 3-nitro-4-aminotoluene.
Claim 6
Dependent Claim
10 words
The method of claim 1 wherein the compound is 2-nitrodiphenylamine.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein the compound is present in an amount of from about 0.05% to about 2.0% by weight.
Claim 8
Dependent Claim
22 words
The method of claim 6 wherein the compound is present in an amount of from about 0.1% to about 1.0% by weight.
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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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |