US2569984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive crystallization process
Assignee: —
•
Filing: —
•
Granted: 1951-10-02
•
Expires: 1968-10-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:50
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152; C07C275/00; C07C275/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR SEPARATING STRAIGHT-CHAIN HYDROCARBONS FROM A HYDROCARBON MIXTURE CONTAINING STRAIGHT-CHAIN AND NON-STRAIGHT-CHAIN HYDROCARBONS AND BOILING WITHIN THE BOILING RANGE OF GASOLINE AND LUBRICATING OIL WHICH COMPRISES TREATING SAID MIXTURE IN LIQUID PHASE AT A TEMPERATURE BELOW ABOUT 100* F. WITH AN AQUEOUS SOLUTION OF UREA AND IN THE PRESENCE OF METHYL ISOBUTYL KETONE AND FORMING CRYSTALLINE MOLECULAR COMPLEXES OF UREA AND STRAIGHT-CHAIN HYDROCARBONS, SAID KETONE BEING PRESENT IN A VOLUME AT LEAST EQUAL TO THAT OF THE HYDROCARBON MIXTURE.
Claim 2
Dependent Claim
81 words
A PROCESS FOR SEPARATING STRAIGHT-CHAIN HYDROCARBONS FROM A HYDROCARBON MIXTURE CONTAINING STRAIGHT-CHAIN AND NON-STRAIGHT-CHAIN HYDROCARBONS AND BOILING WITHIN THE BOILING RANGE OF GASOLINE AND LUBRICATING OIL WHICH COMPRISES TREATING SAID MIXTURE IN LIQUID PHASE AT A TEMPERATURE BELOW ABOUT 100* F. WITH AN AQUEOUS SOLUTION OF UREA AND IN THE PRESENCE OF METHYL ISOBUTYL KETONE AND FORMING CRYSTALLINE MOLECULAR COMPLEXES OF UREA AND STRAIGHT-CHAIN HYDROCARBONS, SAID KETONE BEING PRESENT IN A VOLUME AT LEAST EQUAL TO THAT OF THE HYDROCARBON MIXTURE.
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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) | 1954-10-01 | 1955-04-02 | 1955-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-01 | 1959-04-02 | 1959-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-01 | 1963-04-02 | 1963-10-02 | $7700.00 | Window Closed / Lapsed |