US2666020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sepaeation of wax-like constituents
Assignee: —
•
Filing: 1949-06-07
•
Granted: 1954-01-12
•
Expires: 1969-06-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:59
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE SEPARATION FROM A LUBE OIL OF CONSTITUENTS WHICH FORM CRYSTALLINE COMPLEXES WITH UREA, THE METHOD WHICH COMPRISES SUBJECTING SAID LUBE OIL TO CONTACT WITH UREA IN THE PRESENCE OF WATER AND AN ADDED NORMAL PARAFFIN HYDROCARBON CONTAINING ABOUT 7 TO 14 CARBON ATOMS PER MOLECULE WITH THE RESULT THAT THE COMPLEXFORMING CONSTITUENTS IN THE LUBE OIL ENTER INTO CRYSTALLINE COMPLEX FORMATION WITH UREA, AND SEPARATING RESULTING CRYSTALLINE COMPLEX FROM THE OIL.
Claim 2
Dependent Claim
73 words
IN THE SEPARATION FROM A LUBE OIL OF CONSTITUENTS WHICH FORM CRYSTALLINE COMPLEXES WITH UREA, THE METHOD WHICH COMPRISES SUBJECTING SAID LUBE OIL TO CONTACT WITH UREA IN THE PRESENCE OF WATER AND AN ADDED NORMAL PARAFFIN HYDROCARBON CONTAINING ABOUT 7 TO 14 CARBON ATOMS PER MOLECULE WITH THE RESULT THAT THE COMPLEXFORMING CONSTITUENTS IN THE LUBE OIL ENTER INTO CRYSTALLINE COMPLEX FORMATION WITH UREA, AND SEPARATING RESULTING CRYSTALLINE COMPLEX FROM THE OIL.
References Cited (Backward Citations)
US2499820A
Cited
US2549372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |