Patent US2945858A successfully refreshed from Google Patents.
US2945858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production -of ipyrazines
Assignee: —
•
Filing: —
•
Granted: 1960-07-19
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Expires: 1977-07-19
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:10
CPC Classifications
C; C07; C07D; C07D241/00; C07D241/02; C07D241/10; C07D241/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A PROCESS FOR PRODUCING A PYRAZINE COMPOUND, WHICH COMPRISES HEATING, VAPORIZING AND PASSING A PIPERAZINE COMPOUND OVER A COPPER CHROMITE CATALYST AT A TEMPERATURE OF ABOUT 300-375*C. AND AT A SUPERATMOSPHERIC PRESSURE IN THE RANGE OF ABOUT 5-65 P.S.I.G., SAID PIPERAZINE CORRESPONDING TO THE FOMULA
Claim 2
Dependent Claim
45 words
A PROCESS FOR PRODUCING A PYRAZINE COMPOUND, WHICH COMPRISES HEATING, VAPORIZING AND PASSING A PIPERAZINE COMPOUND OVER A COPPER CHROMITE CATALYST AT A TEMPERATURE OF ABOUT 300-375*C. AND AT A SUPERATMOSPHERIC PRESSURE IN THE RANGE OF ABOUT 5-65 P.S.I.G., SAID PIPERAZINE CORRESPONDING TO THE FOMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |