US2790754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lubricating oil
Assignee: Shell Development Co
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Filing: 1954-11-05
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Granted: 1957-04-30
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Expires: 1974-11-05
Abstract
No abstract record available.
Inventors
- 👤 Robert W B Johnston
- 👤 Jr Thomas P Wier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:34
CPC Classifications
C; C10; C10G; C10G55/00; C10G55/02; C10G55/06; C10G21/00; C10G21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
THE PROCESS OF PRODUCING A LUBRICATING OIL COMPRISING THE STEPS OF: CRACKING A SUBSTANTIALLY NON-LUBE OIL, GAS OIL FEED STOCK, BOILING IN THE BOILING RANGE OF HYDROCARBON LUBRICATING OIL COMPONENTS, AT AN ELEVATED HYDROCARBON-CARCKING TEMPERTURE; FRACTIONATING A HIGH BOILING OIL FRACTION FROM THE CRACKED PRODUCTS BOILING IN THE RANGE OF THE BOILING RANGE OF HYDROCARBON LUBRICATING OIL COMPONENTS; DEASPHALTING THE SEPARATED FRACTION BY MIXING IT WITH AN ASPHALT ANTI-SOLVENT TO INSOLUBILIZE THE ASPHALT IN THE OIL; SELECTIVELY EXTRACTING AROMATIC COMPONENTS FROM NON-AROMATIC COMPONENTS OF THE DEASPHALTED OIL; AND INCLUDING THE STEP OF DEWAXING THE HIGH BOILING OIL FRACTION SUBSEQUENT TO THE DEASPHALTING STEP, WHEREBY A HIGH VISCOSITY INDEX LUBRICATING OIL IS OBTAINED.
Claim 2
Dependent Claim
112 words
THE PROCESS OF PRODUCING A LUBRICATING OIL COMPRISING THE STEPS OF: CRACKING A SUBSTANTIALLY NON-LUBE OIL, GAS OIL FEED STOCK, BOILING IN THE BOILING RANGE OF HYDROCARBON LUBRICATING OIL COMPONENTS, AT AN ELEVATED HYDROCARBON-CARCKING TEMPERTURE; FRACTIONATING A HIGH BOILING OIL FRACTION FROM THE CRACKED PRODUCTS BOILING IN THE RANGE OF THE BOILING RANGE OF HYDROCARBON LUBRICATING OIL COMPONENTS; DEASPHALTING THE SEPARATED FRACTION BY MIXING IT WITH AN ASPHALT ANTI-SOLVENT TO INSOLUBILIZE THE ASPHALT IN THE OIL; SELECTIVELY EXTRACTING AROMATIC COMPONENTS FROM NON-AROMATIC COMPONENTS OF THE DEASPHALTED OIL; AND INCLUDING THE STEP OF DEWAXING THE HIGH BOILING OIL FRACTION SUBSEQUENT TO THE DEASPHALTING STEP, WHEREBY A HIGH VISCOSITY INDEX LUBRICATING OIL IS OBTAINED.
References Cited (Backward Citations)
US2660552A
Cited
US2671051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |