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US3056788A
Expired / Lapsed
US
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Catalytic synthesis of triethylenediamine
Assignee: Jefferson Chemical Co Inc
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Filing: 1961-05-18
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Granted: 1962-10-02
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Expires: 1981-05-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter H Brader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:08
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN A METHOD FOR THE PREPARATION OF TRIETHYLENEDIAMINE BY THE CATALYTIC CONVERSION OF A N-AMINOTHEYLPIPERAZINE, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID N-AMINOETHYLPIPERAZINE FEED STOCK WITH A SOLID SUBSTANTIALLY COMPLETELY SILICA-FREE TUNGTEN CATALYST AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 300* TO ABOUT 500* C. AND A PRESSURE WITHIN THE RANGE OF ABOUT 0.1 TO ABOUT 100 ATMOSPHERES AND RECOVERING TRIETHYLENEDIAMINE FROM THE PRODUCTS OF THE PRODUCTION.
Claim 2
Dependent Claim
67 words
IN A METHOD FOR THE PREPARATION OF TRIETHYLENEDIAMINE BY THE CATALYTIC CONVERSION OF A N-AMINOTHEYLPIPERAZINE, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID N-AMINOETHYLPIPERAZINE FEED STOCK WITH A SOLID SUBSTANTIALLY COMPLETELY SILICA-FREE TUNGTEN CATALYST AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 300* TO ABOUT 500* C. AND A PRESSURE WITHIN THE RANGE OF ABOUT 0.1 TO ABOUT 100 ATMOSPHERES AND RECOVERING TRIETHYLENEDIAMINE FROM THE PRODUCTS OF THE PRODUCTION.
References Cited (Backward Citations)
US2937176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |