US3120526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of triethylenediamine
Assignee: Texaco Inc
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Filing: 1962-01-22
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Granted: 1964-02-04
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Expires: 1982-01-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter H Brader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:36
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
127 words
A METHOD FOR PREPARING TRIETHYLENEDIAMINE WHICH COMPRISES CONTACTING N-AMINOETHYLPIPERAZINE WITH A CATALYST CONSISTING ESSENTIALLY OF FROM ABOUT 60 TO ABOUT 95 WT. PERCENT SILICA, FROM ABOUT 40 TO ABOUT 5 WT. PERCENT OF ALUMINA AND FROM ABOUT 0.1 TO ABOUT 100 MILLIEQUVALENTS OF A BASE PER GRAM OF SILICA-ALUMINA AT A PRESSURE WITHIN THE RANGE OF ABOUT 0.1 P.S.I.A. TO 5,000 P.S.I.G. AND A TEMPERATURE WITHIN THE RANGE OF ABOUT 200* TO ABOUT 500*C. AT THE RATE OF ABOUT 0.1 TO ABOUT 20 POUNDS OF N-AMINOETHYLPIPERAZINE PR POUND OF CATALYST PER HOUR TO THEREBY PROVIDE A REACTION PRODUCT AND RECOVERING TRIETHYLENEDIAMINE FROM SAID REACTION PRODUCT, SAID BASE BEING SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND ALKALINE EARTH METAL HYDROXIDES AND BEING MORE BASIC THAN N-AMINOETHYLPIPERAZINE.
References Cited (Backward Citations)
US2981676A
Cited
US2985658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-03 | 1967-08-05 | 1968-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-03 | 1971-08-05 | 1972-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-03 | 1975-08-05 | 1976-02-04 | $7700.00 | Window Closed / Lapsed |