US3038008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condensation of urea
Assignee: —
•
Filing: —
•
Granted: 1962-06-05
•
Expires: 1979-06-05
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:22
CPC Classifications
C; C07; C07C; C07C275/00; C07C275/04; C07C275/06; C07C275/10; C07C31/00; C07C31/18; C07C31/20; C07C31/202; Y; Y10; Y10S; Y10S8/00; Y10S8/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
A PROCESS FOR CONDENSING ETHYLENE OXIDE WITH A SOLUTION OF UREA AND ETHYLENE GLYCOL WHICH COMPRISES FORMING A SOLUTION OF UREA IN ETHYLENE GLYCOL BY DISSOLVING ABOUT 1 MOLE OF UREA IN ABOUT 1.6 MOLES OPF ETHYLENE GLYCOL, THEREAFTER CONDENSING SAID SOLUTION AT SUPERATMOSPHERIC PRESSURE WITH ETHYLENE OXIDE IN THE PRESENCE OF 0.5% BY WEIGHT OF BORON TRIFLUORIDE ETHERATE AS CATALYST BASED ON THE WEIGHT OF UREA BY INTRODUCING INTO SAID SOLUTION ABOUT 0.735 MOLE OF ETHYLENE OXIDE WHILE MAINTAINING THE REACTION TEMPERATURE AT ABOUT 90* TO 100* C.
References Cited (Backward Citations)
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Cited
US2059213A
Cited
US2483194A
Cited
US2498195A
Cited
US2668807A
Cited
US2834799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-04 | 1965-12-04 | 1966-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-04 | 1969-12-04 | 1970-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-04 | 1973-12-04 | 1974-06-05 | $7700.00 | Window Closed / Lapsed |