US2525584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pyrrolidine
Assignee: EIDP Inc
•
Filing: 1948-06-18
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Granted: 1950-10-10
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Expires: 1968-06-18
Abstract
No abstract record available.
Inventors
- 👤 Charles A Bordner
- 👤 Charles G Kamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:52
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A METHOD OF PREPARING PYRROLIDINE COMPRISING REACTING TETRAHYDROFURAN IN THE VAPOR PHASE WITH AMMONIA IN THE PRESENCE OF GAMMA ALUMINA DEHYDRATION CATALYST AT A TEMPERATURE OF 275-375*C., EMPLOYING 6-20 MOLES OF AMMONIA PER MOLE OF TETRAHYDROFURAN, SEPARTING PYRROLIDINE AND THE HIGH BOILING BY-PRODUCTS FROM THE RESULTING PRODUCT MIXLTURE AND RECYCLING SAID HIGH BOILING BY-PRODUCTS.
Claim 2
Independent Claim
54 words
A METHOD OF PREPARING PYRROLIDINE COMPRISING REACTING TETRAHYDROFURAN IN THE VAPOR PHASE WITH AMMONIA IN THE PRESENCE OF GAMMA ALUMINA DEHYDRATION CATALYST AT A TEMPERATURE OF 275-375*C., EMPLOYING 6-20 MOLES OF AMMONIA PER MOLE OF TETRAHYDROFURAN, SEPARTING PYRROLIDINE AND THE HIGH BOILING BY-PRODUCTS FROM THE RESULTING PRODUCT MIXLTURE AND RECYCLING SAID HIGH BOILING BY-PRODUCTS.
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) | 1953-10-09 | 1954-04-10 | 1954-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-09 | 1958-04-10 | 1958-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-09 | 1962-04-10 | 1962-10-10 | $7700.00 | Window Closed / Lapsed |