Patent US2658887A successfully refreshed from Google Patents.
US2658887A
Expired / Lapsed
US
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Process for forming urea complexes
Assignee: —
•
Filing: 1950-02-11
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Granted: 1953-11-10
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Expires: 1970-02-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:59
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN THE FORMATION OF UREA COMPLEXES BY CONTACT OF A HYDROCARBON MIXTURE CONTANINING COMPLEX-FORMING CONSTITUENTS WITH UREA IN A MEDIUM POSSESSING LOW SOLUBILITY IN SAID HYDROCARBON MIXTURE, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID CONTACT AT A TEMPERATURE BELOW 150* F. IN THE PRESENCE OF A COMPLEX CONSISTING OF UREA AND AN ALIPHATIC HYDROCARBON CONTAINING A STRAIGHT CHAIN OF AT LEAST SIX CARBON ATOMS, AND BEING OF DIFFERENT COMPOSITION THAN THE COMPLEXFORMING CONSTITUENTS PRESENT IN SAID HYDROCARBON MIXTURE, SAID COMPLEX BEING OBTAINED FROM A SOURCE EXTERNAL TO SAID UREA-HYDROCARBON MIXTURE.
Claim 2
Dependent Claim
89 words
IN THE FORMATION OF UREA COMPLEXES BY CONTACT OF A HYDROCARBON MIXTURE CONTANINING COMPLEX-FORMING CONSTITUENTS WITH UREA IN A MEDIUM POSSESSING LOW SOLUBILITY IN SAID HYDROCARBON MIXTURE, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID CONTACT AT A TEMPERATURE BELOW 150* F. IN THE PRESENCE OF A COMPLEX CONSISTING OF UREA AND AN ALIPHATIC HYDROCARBON CONTAINING A STRAIGHT CHAIN OF AT LEAST SIX CARBON ATOMS, AND BEING OF DIFFERENT COMPOSITION THAN THE COMPLEXFORMING CONSTITUENTS PRESENT IN SAID HYDROCARBON MIXTURE, SAID COMPLEX BEING OBTAINED FROM A SOURCE EXTERNAL TO SAID UREA-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) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |