Patent US2589981A successfully refreshed from Google Patents.
US2589981A
Expired / Lapsed
US
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Drying of solid adsorbents
Assignee: Standard Oil Development Co
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Filing: 1948-07-16
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Granted: 1952-03-18
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Expires: 1968-07-16
Abstract
No abstract record available.
Inventors
- 👤 Robert L Weeks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:14
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
AN IMPROVED PROCESS FOR THE REMOVAL OF AROMATIC TYPE COMPOUNDS FROM PETROLEUM OILS BOILING IN THE GAS OIL AND LUBRICATING OIL BOILING RANGES, WHICH COMPRISES TREATING THE OIL IN A PRIMARY STAGE WITH SILICA GEL TO REMOVE THE MORE AROMATIC TYPE COMPOUNDS FROM THE OIL, REMOVING THE SILICA GEL FROM SAID PRIMARY STAGE AND CONTACTING THE SAME IN A SECONDARY STAGE WITH A LIQUID PARAFFIN HYDROCARBON SOLVENT HAVING FROM 4 TO 8 CARBON ATOMS IN THE MOLECULE AT A TEMPERATURE JUST SLIGHTLY BELOW THE BOILING POINT OF THE SOLVENT WHEREIN THE ADSORBEDED AROMATICS ARE REMOVED FROM THE SILICA GEL, REMOVING THE SILICA GEL FROM SAID SECONDARY STAGE AND CONTACTING THE SAME IN A TERTIARY STAGE WITH SUPERHEATED VAPORS OF THE SAME PARAFFIN HYDROCARBON SOLVENT.
Claim 2
Dependent Claim
124 words
AN IMPROVED PROCESS FOR THE REMOVAL OF AROMATIC TYPE COMPOUNDS FROM PETROLEUM OILS BOILING IN THE GAS OIL AND LUBRICATING OIL BOILING RANGES, WHICH COMPRISES TREATING THE OIL IN A PRIMARY STAGE WITH SILICA GEL TO REMOVE THE MORE AROMATIC TYPE COMPOUNDS FROM THE OIL, REMOVING THE SILICA GEL FROM SAID PRIMARY STAGE AND CONTACTING THE SAME IN A SECONDARY STAGE WITH A LIQUID PARAFFIN HYDROCARBON SOLVENT HAVING FROM 4 TO 8 CARBON ATOMS IN THE MOLECULE AT A TEMPERATURE JUST SLIGHTLY BELOW THE BOILING POINT OF THE SOLVENT WHEREIN THE ADSORBEDED AROMATICS ARE REMOVED FROM THE SILICA GEL, REMOVING THE SILICA GEL FROM SAID SECONDARY STAGE AND CONTACTING THE SAME IN A TERTIARY STAGE WITH SUPERHEATED VAPORS OF THE SAME PARAFFIN HYDROCARBON SOLVENT.
References Cited (Backward Citations)
US2415315A
Cited
US2398101A
Cited
US2449402A
Cited
US2441572A
Cited
US2464311A
Cited
US2448489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |