US2565489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of dewaxing of mineral and tar oils
Assignee: Individual
•
Filing: 1948-06-22
•
Granted: 1951-08-28
•
Expires: 1968-06-22
Abstract
No abstract record available.
Inventors
- 👤 Karl A Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:44
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN THE PROCESS OF DEWAXING OIL BY DISSOLVING WAXY OIL IN A COMBINATION OF A SELECTIVE AND A NON-SELECTIVE SOLVENT, FOLLOWED BY PROGRESSIVELY CHILLING THE SOLUTION AND SEPARATING THE WAX FROM THE CHILLED SOLUTION: THE IMPROVEMENT COMPRISING THE STEP OF PROGRESSIVELY REDUCING THE RATIO OF SELECTIVE SOLVENT TO THE REMAINING COMPONENTS OF SAID SOLUTION DURING SAID CHILLING, SAID REDUCTION BEING SUBSTANTIALLY PROPORTIONAL TO THE RATE OF PROGRESS OF SAID CHILLING, SO AS TO MAINTAIN SAID SOLUTION IN A HOMOGENEOUS STATE THROUGHOUT THE CHILLING PROCESS.
Claim 2
Dependent Claim
84 words
IN THE PROCESS OF DEWAXING OIL BY DISSOLVING WAXY OIL IN A COMBINATION OF A SELECTIVE AND A NON-SELECTIVE SOLVENT, FOLLOWED BY PROGRESSIVELY CHILLING THE SOLUTION AND SEPARATING THE WAX FROM THE CHILLED SOLUTION: THE IMPROVEMENT COMPRISING THE STEP OF PROGRESSIVELY REDUCING THE RATIO OF SELECTIVE SOLVENT TO THE REMAINING COMPONENTS OF SAID SOLUTION DURING SAID CHILLING, SAID REDUCTION BEING SUBSTANTIALLY PROPORTIONAL TO THE RATE OF PROGRESS OF SAID CHILLING, SO AS TO MAINTAIN SAID SOLUTION IN A HOMOGENEOUS STATE THROUGHOUT THE CHILLING PROCESS.
References Cited (Backward Citations)
US2303721A
Cited
US2167970A
Cited
US2170508A
Cited
US2191136A
Cited
US2287966A
Cited
US2342798A
Cited
US2347809A
Cited
US2420418A
Cited
US2487472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |