US2710855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive crystallization processes
Assignee: —
•
Filing: 1952-05-08
•
Granted: 1955-06-14
•
Expires: 1972-05-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:14
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152; B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR THE EXTRACTIVE CRYSTALLIZATION OF MINERAL OILS WHICH COMPRISES TREATING A MINERAL OIL WITH A SOLUTION OF UREA IN A SOLVENT COMPRISING WATER, IN THE PRESENCE OF BIURET IN THE PROPORTION OF 0.2 TO 5% BY WEIGHT RELATIVE TO THE UREA CONTENT, WHEREBY A SOLID UREA ADDUCT IS FORMED WITH SOME COMPONENTS OF SAID MINERAL OIL, SEPARATING SAID SOLID UREA ADDUCT FROM THE REMAINING COMPONENTS OF SAID MINERAL OIL, DECOMPOSING SAID UREA ADDUCT AND RECOVERING THE LIBERATED COMPONENTS OF SAID MINERAL OIL.
Claim 2
Dependent Claim
84 words
A PROCESS FOR THE EXTRACTIVE CRYSTALLIZATION OF MINERAL OILS WHICH COMPRISES TREATING A MINERAL OIL WITH A SOLUTION OF UREA IN A SOLVENT COMPRISING WATER, IN THE PRESENCE OF BIURET IN THE PROPORTION OF 0.2 TO 5% BY WEIGHT RELATIVE TO THE UREA CONTENT, WHEREBY A SOLID UREA ADDUCT IS FORMED WITH SOME COMPONENTS OF SAID MINERAL OIL, SEPARATING SAID SOLID UREA ADDUCT FROM THE REMAINING COMPONENTS OF SAID MINERAL OIL, DECOMPOSING SAID UREA ADDUCT AND RECOVERING THE LIBERATED COMPONENTS OF SAID MINERAL OIL.
References Cited (Backward Citations)
US2400394A
Cited
US2557257A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-13 | 1958-12-13 | 1959-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-13 | 1962-12-13 | 1963-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-13 | 1966-12-13 | 1967-06-14 | $7700.00 | Window Closed / Lapsed |