Patent US2698321A successfully refreshed from Google Patents.
US2698321A
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US
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Flash
Assignee: —
•
Filing: —
•
Granted: 1954-12-28
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Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:35
CPC Classifications
C; C10; C10G; C10G25/00; C10G25/003; C07; C07C; C07C275/00; C07C275/02; C07C335/00; C07C335/02; C07C7/00; C07C7/148; C07C7/152; C10G25/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN A METHOD FOR RESOLVING A LIQUID MIXTURE OF ORGANIC COMPOUNDS, WHEREIN ONE OF SAID COMPOUNDS IS REACTIVE WITH AN AMIDE SELECTED FROM THE GROUP CONSISTING OF UREA AND THIOUREA TO FORM A SOLID ADDUCT THEREWITH, BY CONTACTING SAID MIXTURE WITH SAID AMIDE, THE IMPROVEMENT WHICH COMPRISES PASSING SAID MIXTURE UPWARDLY THROUGH A BED OF SAID AMIDE; CONTROLLING THE VELOCITY OF
Claim 2
Dependent Claim
61 words
IN A METHOD FOR RESOLVING A LIQUID MIXTURE OF ORGANIC COMPOUNDS, WHEREIN ONE OF SAID COMPOUNDS IS REACTIVE WITH AN AMIDE SELECTED FROM THE GROUP CONSISTING OF UREA AND THIOUREA TO FORM A SOLID ADDUCT THEREWITH, BY CONTACTING SAID MIXTURE WITH SAID AMIDE, THE IMPROVEMENT WHICH COMPRISES PASSING SAID MIXTURE UPWARDLY THROUGH A BED OF SAID AMIDE; CONTROLLING THE VELOCITY OF
References Cited (Backward Citations)
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Cited
US2444990A
Cited
US2386734A
Cited
US2455419A
Cited
US2499820A
Cited
US2557202A
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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) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |