US2793171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibitor sweetening of straight-run heating oils containing added olefins with a phenylene-diamine, alkali and oxygen
Assignee: Union Oil Company of California
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Filing: 1954-04-22
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Granted: 1957-05-21
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Expires: 1974-04-22
Abstract
No abstract record available.
Inventors
- 👤 James L Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:03
CPC Classifications
C; C10; C10G; C10G27/00; C10G27/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A METHOD FOR SWWEETENING A SOUR, STRAIGHT-RUN FUEL OIL DISTILLATE BOILING SUBSTANTIALLY ENTIRELY ABOVE 350*F. WITHOUT SUBSTANTIAL COLOR DEGRADATION THEREOF, WHICH COMPRISES ADMIXING WITH SAID STRAIGHT-RUN DISTILLATE A SMALL PROPORTION, BETWEEN ABOUT 1% AND 5% BY VOLUME, OF A CRACKED MINERAL OIL FRACTION BOILING WITHIN THE BOILING RANGE OF SAID STRAIGHT-RUN DISTILLATE AND CONTAINING A SUBSTANTIAL PROPORTION OF HIGH-BOILING OLEFINS, ADMIXING THEREWITH A MINOR PROPORTION OF AN N,N''-DIALKYL P-PHENYLENE DIAMINE INHIBITOR, AGITATING THE RESULTING MIXTURE IN THE PRESENCE OF OXYGEN AND IN INTIMATE CONTACT WITH BETWEEN ABOUT 1% AND 10% BY VOLUME OF A CAUSTIC SOLUTION CONTAINING BETWEEN ABOUT 2% AND 25% BY WEIGHT OF SOLID CAUSTIC DISSOLVED IN WATER, CONTINUING SAID AGITATION AT A TEMPERATURE BETWEEN ABOUT 100* AND 130*F. FOR A PERIOD OF TIME BETWEEN ABOUT 5 AND 48 HOURS, AND THEN SEPARATING SAID AQUEOUS CAUSTIC SOLUTION, THEREBY OBTAINING A SWEENTENED, GUM-STABLE PRODUCT.
Claim 2
Independent Claim
145 words
A METHOD FOR SWWEETENING A SOUR, STRAIGHT-RUN FUEL OIL DISTILLATE BOILING SUBSTANTIALLY ENTIRELY ABOVE 350*F. WITHOUT SUBSTANTIAL COLOR DEGRADATION THEREOF, WHICH COMPRISES ADMIXING WITH SAID STRAIGHT-RUN DISTILLATE A SMALL PROPORTION, BETWEEN ABOUT 1% AND 5% BY VOLUME, OF A CRACKED MINERAL OIL FRACTION BOILING WITHIN THE BOILING RANGE OF SAID STRAIGHT-RUN DISTILLATE AND CONTAINING A SUBSTANTIAL PROPORTION OF HIGH-BOILING OLEFINS, ADMIXING THEREWITH A MINOR PROPORTION OF AN N,N''-DIALKYL P-PHENYLENE DIAMINE INHIBITOR, AGITATING THE RESULTING MIXTURE IN THE PRESENCE OF OXYGEN AND IN INTIMATE CONTACT WITH BETWEEN ABOUT 1% AND 10% BY VOLUME OF A CAUSTIC SOLUTION CONTAINING BETWEEN ABOUT 2% AND 25% BY WEIGHT OF SOLID CAUSTIC DISSOLVED IN WATER, CONTINUING SAID AGITATION AT A TEMPERATURE BETWEEN ABOUT 100* AND 130*F. FOR A PERIOD OF TIME BETWEEN ABOUT 5 AND 48 HOURS, AND THEN SEPARATING SAID AQUEOUS CAUSTIC SOLUTION, THEREBY OBTAINING A SWEENTENED, GUM-STABLE PRODUCT.
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) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |