Patent US2663671A successfully refreshed from Google Patents.
US2663671A
Expired / Lapsed
US
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Method of breaking a urea complex
Assignee: —
•
Filing: —
•
Granted: 1953-12-22
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Expires: 1970-12-22
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:36
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/24; C07; C07C; C07C275/00; C07C275/02; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN THE PROCESS OF BREAKING A COMPLEX OF UREA AND SOLID HYDROCARBONS, SAID COMPLEX CONTAINING ABOUT 1 TO ABOUT 5% WATER, THE STEPS WHICH COMPRISE HEATING SAID COMPLEX IN THE PRESENCE OF A SOLVENT CONSISTING ESSENTIALLY OF A LIQUID HYDROCARBON WHICH IS A NON-SOLVENT FOR UREA AND NONREACTIVE WITH UREA UNTIL BOTH UREA AND A SOLVENT SOLUTION OF THE SOLID HYDROCARBONS, SEPARATE, COOLING WITH AGITATION UNIL THE UREA CRYSTALLIZES IN A GRANULAR FORM BUT ABOVE THE TEMPERATURE AT WHICH THE UREA WILL COMBINE WITH REGENERATED HYDROCARBON IN SAID SOLVENT, AND REMOVING THE UREA IN A FORM SUITABLE FOR REACTION WITH FURTHER HYDROCARBON.
Claim 2
Dependent Claim
102 words
IN THE PROCESS OF BREAKING A COMPLEX OF UREA AND SOLID HYDROCARBONS, SAID COMPLEX CONTAINING ABOUT 1 TO ABOUT 5% WATER, THE STEPS WHICH COMPRISE HEATING SAID COMPLEX IN THE PRESENCE OF A SOLVENT CONSISTING ESSENTIALLY OF A LIQUID HYDROCARBON WHICH IS A NON-SOLVENT FOR UREA AND NONREACTIVE WITH UREA UNTIL BOTH UREA AND A SOLVENT SOLUTION OF THE SOLID HYDROCARBONS, SEPARATE, COOLING WITH AGITATION UNIL THE UREA CRYSTALLIZES IN A GRANULAR FORM BUT ABOVE THE TEMPERATURE AT WHICH THE UREA WILL COMBINE WITH REGENERATED HYDROCARBON IN SAID SOLVENT, AND REMOVING THE UREA IN A FORM SUITABLE FOR REACTION WITH FURTHER HYDROCARBON.
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) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |