US3067199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing alkyl-substituted piperazines, alkyl-substituted pyrazines, andmixtures thereof
Assignee: Wyandotte Chemicals Corp
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Filing: 1956-09-13
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Granted: 1962-12-04
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Expires: 1976-09-13
Abstract
No abstract record available.
Inventors
- 👤 William K Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:33
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
31 words
A METHOD FOR PREPARING ALKYL-SUBSTITUTED PIPERAZINES, ALKYL-SUBSTITUTED PYRAZINES, AND MIXTURES OF SAID PIPERAZINES AND PYRAZINES WHICH COMPRISES, VAPORIZING AN ALKANOLAMINE SELECTED FROM THE GROUP CONSISTING OF ALKANOLAMINES CORRESPONDING TO THE FORMULA
Claim 2
Independent Claim
31 words
A METHOD FOR PREPARING ALKYL-SUBSTITUTED PIPERAZINES, ALKYL-SUBSTITUTED PYRAZINES, AND MIXTURES OF SAID PIPERAZINES AND PYRAZINES WHICH COMPRISES, VAPORIZING AN ALKANOLAMINE SELECTED FROM THE GROUP CONSISTING OF ALKANOLAMINES CORRESPONDING TO THE FORMULA
Claim 3
Independent Claim
32 words
A METHOD FOR PREPARING 2,5-DIMETHYLPYRAZINE WHICH COMPRISES HEATING ISOPROPANOLAMINE IN THE PRESENCE OF A NICKEL DEHYDROGENATION CATALYST IN THE VAPOR PHASE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 175*C. TO 400*C.
Claim 4
Independent Claim
32 words
A METHOD FOR PREPARING 2,5-DIMETHYLPYRAZINE WHICH COMPRISES HEATING ISOPROPANOLAMINE IN THE PRESENCE OF A NICKEL DEHYDROGENATION CATALYST IN THE VAPOR PHASE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 175*C. TO 400*C.
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) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |