Patent US2654737A successfully refreshed from Google Patents.
US2654737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing derivatives of ethyleneimine
Assignee: Hoechst AG
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Filing: 1950-09-13
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Granted: 1953-10-06
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Expires: 1970-09-13
Abstract
No abstract record available.
Inventors
- 👤 Bestian Herbert
- 👤 Hochst Main
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:14
CPC Classifications
C; C07; C07D; C07D203/00; C07D203/04; C07D203/06; C07D203/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
THE PROCESS WHICH COMPRISES REACTING, IN THE PRESENCE OF ALKALI METALS, ETHYLENE IMINE WITH A HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF BUTADIENE AND STYRENE.
Claim 2
Dependent Claim
25 words
THE PROCESS WHICH COMPRISES REACTING, IN THE PRESENCE OF ALKALI METALS, ETHYLENE IMINE WITH A HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF BUTADIENE AND STYRENE.
References Cited (Backward Citations)
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US2368082A
Cited
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Cited
DE715544C
Cited
US2212146A
Cited
US2409287A
Cited
US2520264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |