US2843589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for hydrogenating pyrazine and derivatives of pyrazine
Assignee: Dow Chemical Co
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Filing: 1955-11-18
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Granted: 1958-07-15
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Expires: 1975-11-18
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Scigliano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:32
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/02; C07D295/023
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
METHOD FOR HYDROGENATING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PYRAZINE, ALKYLPYRAZINES IN WHICH EACH ALKYL SUBSTITUENT CONTAINS NOT MORE THAN 4 CARBON ATOMS, AND MIXTURES THEREOF TO CORRESPONDING PIPERAZINE PRODUCTS WHICH CONSISTS OF SUBJECTING THE PYRAZINE COMPOUND TO HYDROGEN IN THE PRESENCE OF A HYDROGENERATION CATALYST SELECTED FROM THE GROUP CONSISTING OF RANEY NICKEL, SUPPORTED REDUCED NICKEL, SUPPORTED RHODIUM, AND USPPORTED PALLADIUM AT A HYDROGENATION-FAVORING TEMPERATURE FOR THE CATALYST, SAID TEMPERATURE BEING BETWEEN ABOUT 125 AND 225*C., AND UNDER A PRESSURE BETWEEN ABOUT 200 AND 600 POUNDS PER SQUARE INCH.
Claim 2
Dependent Claim
92 words
METHOD FOR HYDROGENATING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF PYRAZINE, ALKYLPYRAZINES IN WHICH EACH ALKYL SUBSTITUENT CONTAINS NOT MORE THAN 4 CARBON ATOMS, AND MIXTURES THEREOF TO CORRESPONDING PIPERAZINE PRODUCTS WHICH CONSISTS OF SUBJECTING THE PYRAZINE COMPOUND TO HYDROGEN IN THE PRESENCE OF A HYDROGENERATION CATALYST SELECTED FROM THE GROUP CONSISTING OF RANEY NICKEL, SUPPORTED REDUCED NICKEL, SUPPORTED RHODIUM, AND USPPORTED PALLADIUM AT A HYDROGENATION-FAVORING TEMPERATURE FOR THE CATALYST, SAID TEMPERATURE BEING BETWEEN ABOUT 125 AND 225*C., AND UNDER A PRESSURE BETWEEN ABOUT 200 AND 600 POUNDS PER SQUARE INCH.
References Cited (Backward Citations)
US1975843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |