Patent US3037023A successfully refreshed from Google Patents.
US3037023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of piperazine
Assignee: Jefferson Chemical Co Inc
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Filing: 1957-06-03
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Granted: 1962-05-29
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Expires: 1977-06-03
Abstract
No abstract record available.
Inventors
- 👤 Philip H Moss
- 👤 Godfrey Norman Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:46
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD FOR THE PREPARATION OF PIPERAZINE WHICH COMPRISES REACTING AN ETHANOLAMINE SELECTED FROM THE GROUP CONSISTING OF MONOETHANOLAMINE, DIETHANOLAMINE TRIETHANOLAMINE, AND MIXTURE THEREOF, WITH A MOLAR EXCESS OF AMMONIA OF AT LEAST ABOUT 2 TO 1 AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 150* TO ABOUT 400* C. UNDER A PRESSURE WITHIN THE RANGE OF ABOUT 30 TO ABOUT 400 ATMOSPHERES IN THE PRESENCE OF AT LEAST 10 ATMOSPHERES PARTICAL PRESSURE OF HYDROGEN AND A SOLID HYDROGENATION CATALYST WHEREBY PIPERAZINE IS FORMED AS A SIGNIFICANT REACTION PRODUCT AND REMOVING PIPERAZINE FROM THE OTHER COMPONENTS OF SAID REACTION PRODUCT, SAID CATALYST COMPRISING A CATALYTICALLY ACTIVE METALLIFEROUS MEMBER SELECTED FROM THE GROUP CONSISTING OF METALS AND OXIDES OF NICKEL, COPPER, COBALT AND MIXTURES THEREOF.
Claim 2
Independent Claim
124 words
A METHOD FOR THE PREPARATION OF PIPERAZINE WHICH COMPRISES REACTING AN ETHANOLAMINE SELECTED FROM THE GROUP CONSISTING OF MONOETHANOLAMINE, DIETHANOLAMINE TRIETHANOLAMINE, AND MIXTURE THEREOF, WITH A MOLAR EXCESS OF AMMONIA OF AT LEAST ABOUT 2 TO 1 AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 150* TO ABOUT 400* C. UNDER A PRESSURE WITHIN THE RANGE OF ABOUT 30 TO ABOUT 400 ATMOSPHERES IN THE PRESENCE OF AT LEAST 10 ATMOSPHERES PARTICAL PRESSURE OF HYDROGEN AND A SOLID HYDROGENATION CATALYST WHEREBY PIPERAZINE IS FORMED AS A SIGNIFICANT REACTION PRODUCT AND REMOVING PIPERAZINE FROM THE OTHER COMPONENTS OF SAID REACTION PRODUCT, SAID CATALYST COMPRISING A CATALYTICALLY ACTIVE METALLIFEROUS MEMBER SELECTED FROM THE GROUP CONSISTING OF METALS AND OXIDES OF NICKEL, COPPER, COBALT AND MIXTURES THEREOF.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-28 | 1965-11-27 | 1966-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-28 | 1969-11-27 | 1970-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-28 | 1973-11-27 | 1974-05-29 | $7700.00 | Window Closed / Lapsed |