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Patent US3105019A successfully refreshed from Google Patents.
US3105019A
Expired / Lapsed
US
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Recovery of piperazine
Assignee: Union Carbide Corp
•
Filing: 1958-11-04
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Granted: 1963-09-24
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Expires: 1978-11-04
Abstract
No abstract record available.
Inventors
- 👤 Jr James V Murray
- 👤 David W Peck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:57
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR THE RECOVERY OF PIPERAZINE FROM A MIXTURE WITH TRIETHYLENEDIAMINE WHICH COMPRISES SUBJECTING SAID MIXTURE TO AZEOTROPIC DISTILLATION IN THE PRESENCE OF AT LEAST ONE HYDROCARBON HAVING A BOILING POINT WITHIN THE RANGE OF FROM ABOUT 110*C. TO ABOUT 200* C. SO AS TO OBTAIN A DISTILLATE COMPRISED ESSENTIALLY OF A PIPERAZINE-HYDROCARBON AZEOTROPE AND SEPARATING THE PIPERAZINE COMPONENT FROM SAID DISTILLATE.
Claim 2
Dependent Claim
63 words
A PROCESS FOR THE RECOVERY OF PIPERAZINE FROM A MIXTURE WITH TRIETHYLENEDIAMINE WHICH COMPRISES SUBJECTING SAID MIXTURE TO AZEOTROPIC DISTILLATION IN THE PRESENCE OF AT LEAST ONE HYDROCARBON HAVING A BOILING POINT WITHIN THE RANGE OF FROM ABOUT 110*C. TO ABOUT 200* C. SO AS TO OBTAIN A DISTILLATE COMPRISED ESSENTIALLY OF A PIPERAZINE-HYDROCARBON AZEOTROPE AND SEPARATING THE PIPERAZINE COMPONENT FROM SAID DISTILLATE.
References Cited (Backward Citations)
US2813869A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-23 | 1967-03-25 | 1967-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-23 | 1971-03-25 | 1971-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-23 | 1975-03-25 | 1975-09-24 | $7700.00 | Window Closed / Lapsed |