US2526757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethyleneurea
Assignee: EIDP Inc
•
Filing: 1947-09-20
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Granted: 1950-10-24
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Expires: 1967-09-20
Abstract
No abstract record available.
Inventors
- 👤 Alfred T Larson
- 👤 Donald J Loder
- 👤 Harry R Dittmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:39
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/04; C07D233/28; C07D233/30; C07D233/32; C07D233/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A PROCESS FOR THE PREPARATION OF ETHYLENEUREA WHICH CONSISTS IN SUBJECTING UREA TO A REACTION WITH A SUBSTITUED ETHAN AS ILLUSTRATED BY THE EQUATION:
Claim 2
Dependent Claim
24 words
A PROCESS FOR THE PREPARATION OF ETHYLENEUREA WHICH CONSISTS IN SUBJECTING UREA TO A REACTION WITH A SUBSTITUED ETHAN AS ILLUSTRATED BY THE EQUATION:
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) | 1953-10-23 | 1954-04-24 | 1954-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-23 | 1958-04-24 | 1958-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-23 | 1962-04-24 | 1962-10-24 | $7700.00 | Window Closed / Lapsed |