US2732328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage solvent dewaxing of
Assignee: —
•
Filing: —
•
Granted: 1956-01-24
•
Expires: 1973-01-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:43
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A METHOD FOR SEPARATING A WAXY MINERAL OIL INTO SEVERAL COMPONENTS INCLUDING THE STEPS OF ADDING TO THE WAXY MINERAL OIL A METHYL ETHYL KETONE TOLUOL MIXTURE CONSISTING OF A MAJOR PORTION OF METHYL ETHYL KETONE SUCH THAT A SOLVENT RICH PHASE CONTAINING LOW VISCOSITY INDEX OIL AND A SOLVENT LEAN PHASE CONTAINING HIGH VISCOSITY INDEX OIL WILL FORM AT A TEMPERATURE AT LEAST APPROXIMATELY 40* F. HIGHER THAN A SELECTED DEWAXING TEMPERATURE, CHILLIN G THE RESULTANT SOLUTION TO THE SELECTED DEWAXING TEMPERATURE TO CAUSE IT TO FORM A SOLVENT RICH PHASE CONTAINING LOW VISCOSITY INDEX OIL, A SOLVENT LEAN PHASE CONTAINING
Claim 2
Independent Claim
102 words
A METHOD FOR SEPARATING A WAXY MINERAL OIL INTO SEVERAL COMPONENTS INCLUDING THE STEPS OF ADDING TO THE WAXY MINERAL OIL A METHYL ETHYL KETONE TOLUOL MIXTURE CONSISTING OF A MAJOR PORTION OF METHYL ETHYL KETONE SUCH THAT A SOLVENT RICH PHASE CONTAINING LOW VISCOSITY INDEX OIL AND A SOLVENT LEAN PHASE CONTAINING HIGH VISCOSITY INDEX OIL WILL FORM AT A TEMPERATURE AT LEAST APPROXIMATELY 40* F. HIGHER THAN A SELECTED DEWAXING TEMPERATURE, CHILLIN G THE RESULTANT SOLUTION TO THE SELECTED DEWAXING TEMPERATURE TO CAUSE IT TO FORM A SOLVENT RICH PHASE CONTAINING LOW VISCOSITY INDEX OIL, A SOLVENT LEAN PHASE CONTAINING
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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) | 1959-01-23 | 1959-07-25 | 1960-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-23 | 1963-07-25 | 1964-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-23 | 1967-07-25 | 1968-01-24 | $7700.00 | Window Closed / Lapsed |