Patent US3152084A successfully refreshed from Google Patents.
US3152084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation of amids completing beds
Assignee: —
•
Filing: —
•
Granted: 1964-10-06
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Expires: 1981-10-06
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:44
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/016
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN A METHOD OF PREPARING A BED OF AN INERT SOLID CARRIER HAVING DISPERSED THERETHROUGH SOLID UREA, THE IMPROVEMENT WHICH COMPRISES IMMERSING SAID INERT SOLID CARRIER IN A HEATED AQUEOUS SATURATED SOLUTION OF SAID UREA, SUBSTANTIALLY COOLING THE SOLUTION TO PRECIPITATE THE UREA FROM THE SOLUTION, REMOVING WATER AND EXCESS UREA AND THEN WASHING THE IMPREGNATED INERT SOLID CARRIER WITH A LIQUID IN WHICH WATER IS HIGHLY SOLUBLE BUT IN WHICH THE UREA IS VERY SPARINGLY SOLUBLE AND WHICH LIQUID HAS A RELATIVELY LOW VAPOR PRESSURE, SAID LIQUID BEING SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, PROPANOL AND ISOPROPANOL.
Claim 2
Dependent Claim
100 words
IN A METHOD OF PREPARING A BED OF AN INERT SOLID CARRIER HAVING DISPERSED THERETHROUGH SOLID UREA, THE IMPROVEMENT WHICH COMPRISES IMMERSING SAID INERT SOLID CARRIER IN A HEATED AQUEOUS SATURATED SOLUTION OF SAID UREA, SUBSTANTIALLY COOLING THE SOLUTION TO PRECIPITATE THE UREA FROM THE SOLUTION, REMOVING WATER AND EXCESS UREA AND THEN WASHING THE IMPREGNATED INERT SOLID CARRIER WITH A LIQUID IN WHICH WATER IS HIGHLY SOLUBLE BUT IN WHICH THE UREA IS VERY SPARINGLY SOLUBLE AND WHICH LIQUID HAS A RELATIVELY LOW VAPOR PRESSURE, SAID LIQUID BEING SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, PROPANOL AND ISOPROPANOL.
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) | 1967-10-06 | 1968-04-06 | 1968-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-06 | 1972-04-06 | 1972-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-06 | 1976-04-06 | 1976-10-06 | $7700.00 | Window Closed / Lapsed |