Patent US3793397A successfully refreshed from Google Patents.
US3793397A
Expired / Lapsed
US
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Process for the production of aminoethylpiperazine
Assignee: Texaco Inc
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Filing: 1972-07-12
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Granted: 1974-02-19
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Expires: 1992-07-12
Abstract
Abstract AMINOETHYLPIPERAZINE (AEP) IS PRODUCED BY HEATING MONOETHANOLAMINE (MEA) IN THE PRESENCE OF AMMONIA AND HYDROGEN IN AN AQUEOUS MEDIUM OVER HYDROGENATION CATALYST. MY INVENTION IS AN IMPROVEMENT OVER THIS PROCESS WHEREIN THE PRODUCTION OF AEP IS MAXIMIZED BY RECYCLING A PORTION OF THE PRODUCT STREAM CONTAINING PIPERAZINE TO THE STARTING MIXTURE. AMINOETHYLPIPERAZINE IS AN EPOXY RESIN CURING AGENT; AN INTERMEDIATE IN THE PREPARATION OF COROSION INHINITORS, ASPHALT ADDITIVES, EMULSION BREAKERS, EMULSIFYING AGENTS, PHARMACEUTICALS, DYES, TEXTILE CHEMICALS, AND SURFACTANTSo
Inventors
- 👤 M Lichtenwalter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:46
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023; C07D295/04; C07D295/12; C07D295/125; C07D295/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |