Patent US3293173A successfully refreshed from Google Patents.
US3293173A
Expired / Lapsed
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Color improvement of petroleum lubricating oils
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1964-07-31
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Granted: 1966-12-20
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Expires: 1984-07-31
Abstract
No abstract record available.
Inventors
- 👤 Patrick P Mccall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:37
CPC Classifications
C; C10; C10G; C10G7/00; C10G67/00; C10G67/02; C10G67/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A PROCESS FOR IMPROVING THE COLOR AND COLOR STABILITY OF A PETROLEUM LUBRICATING OIL BASE STOCK WHICH COMPRISES HYDROFINING THE LUBRICATING OIL BASE STOCK IN THE PRESENCE OF A HYDROFINING CATALYST AND HYDROGEN, INTRODUCING AN AQUEOUS ALKALINE METAL HYDROXIDE INTO THE HYDROFINED OIL, SAID METAL HYDROXIDE BEING SELECTED FROM THE GROUP CONSISTING OF HYDROXIDES OF THE ALKALI METALS AND ALKALINE EARTH METALS AND BEING USED IN AN AMOUNT BETWEEN .0005 AND .01 PART BY WEIGHT PER PART OF OIL BY WEIGHT, HEATING
Claim 2
Dependent Claim
82 words
A PROCESS FOR IMPROVING THE COLOR AND COLOR STABILITY OF A PETROLEUM LUBRICATING OIL BASE STOCK WHICH COMPRISES HYDROFINING THE LUBRICATING OIL BASE STOCK IN THE PRESENCE OF A HYDROFINING CATALYST AND HYDROGEN, INTRODUCING AN AQUEOUS ALKALINE METAL HYDROXIDE INTO THE HYDROFINED OIL, SAID METAL HYDROXIDE BEING SELECTED FROM THE GROUP CONSISTING OF HYDROXIDES OF THE ALKALI METALS AND ALKALINE EARTH METALS AND BEING USED IN AN AMOUNT BETWEEN .0005 AND .01 PART BY WEIGHT PER PART OF OIL BY WEIGHT, HEATING
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) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |