US2670343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Complex-forming crystallization
Assignee: —
•
Filing: —
•
Granted: 1954-02-23
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Expires: 1971-02-23
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:02
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152; C07C275/00; C07C275/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A PROCESS FOR THE SEPARATION OF STRAIGHT CHAIN HYDROCARBONS FROM A MIXTURE THEREOF WITH NON-STRAIGHT CHAIN HYDROCARBONS WHICH COMPRISES CONTACTING SAID MIXTURE WITH AN AQUEOUS SOLUTION OF UREA AT A TEMPERATURE BELOW 75* C. TO FORM A SOLID PHASE CONSISTING OF CRYSTALLINE MOLECULAR COMPLEXES OF UREA WITH STRAIGHT-CHAIN HYDROCARBONS, AN AQUEOUS PHASE CONSISTING OF A DILUTE AQUEOUS SOLUTION OF UREA AND A NONSTRAIGHT CHAIN HYDROCARBON PHASE: SEPARATELY RECOVERING SAID PHASE; ADMIXING THE DILUTE UREA SOLUTION WITH SAID CRYSTALLINE COMPLEXES; HEATING SAID ADMIXTURE TO A TEMPERATURE BETWEEN ABOUT 45* AND 90* C, WHEREBY THE COMPLEXES ARE DECOMPOSED TO LIBERATE UREA AND STRAIGHT CHAIN HYDROCARBONS AND WHEREBY THE DILUTE UREA SOLUTION IS REINFORCED WITH SAID LIBERATED UREA; SEPARATING THE REINFORCED UREA SOLUTION FROM THE STRAIGHT CHAIN HYDROCARBONS AND RECYCLING THE REINFORCED UREA SOLUTION FOR TREATMENT OF FURTHER QUANTITIES OF THE ORIGINAL HYDROCARBON MIXTURE.
Claim 2
Dependent Claim
141 words
A PROCESS FOR THE SEPARATION OF STRAIGHT CHAIN HYDROCARBONS FROM A MIXTURE THEREOF WITH NON-STRAIGHT CHAIN HYDROCARBONS WHICH COMPRISES CONTACTING SAID MIXTURE WITH AN AQUEOUS SOLUTION OF UREA AT A TEMPERATURE BELOW 75* C. TO FORM A SOLID PHASE CONSISTING OF CRYSTALLINE MOLECULAR COMPLEXES OF UREA WITH STRAIGHT-CHAIN HYDROCARBONS, AN AQUEOUS PHASE CONSISTING OF A DILUTE AQUEOUS SOLUTION OF UREA AND A NONSTRAIGHT CHAIN HYDROCARBON PHASE: SEPARATELY RECOVERING SAID PHASE; ADMIXING THE DILUTE UREA SOLUTION WITH SAID CRYSTALLINE COMPLEXES; HEATING SAID ADMIXTURE TO A TEMPERATURE BETWEEN ABOUT 45* AND 90* C, WHEREBY THE COMPLEXES ARE DECOMPOSED TO LIBERATE UREA AND STRAIGHT CHAIN HYDROCARBONS AND WHEREBY THE DILUTE UREA SOLUTION IS REINFORCED WITH SAID LIBERATED UREA; SEPARATING THE REINFORCED UREA SOLUTION FROM THE STRAIGHT CHAIN HYDROCARBONS AND RECYCLING THE REINFORCED UREA SOLUTION FOR TREATMENT OF FURTHER QUANTITIES OF THE ORIGINAL HYDROCARBON MIXTURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |