Patent US3227094A successfully refreshed from Google Patents.
Patent US2673203A successfully refreshed from Google Patents.
US2673203A
Expired / Lapsed
US
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Preparation of decahydrodipyrrolo(a, d)-pyrazine
Assignee: Corn Products Refining Co
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Filing: 1951-10-27
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Granted: 1954-03-23
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Expires: 1971-10-27
Abstract
No abstract record available.
Inventors
- 👤 Segel Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:23
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/12; C07D487/14; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/232; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
DECAHYDRODIPYRROLO-(A,D)-PYRAZINE.
Claim 2
Dependent Claim
1 words
DECAHYDRODIPYRROLO-(A,D)-PYRAZINE.
Claim 3
Dependent Claim
54 words
PROCESS FOR THE PREPARATION OF DECAHYDRODIPYRROLO-(A,D)-PYRAZINE, WHICH COMPRISES REACTING BUTYL PYROGLUTAMATE WITH HYDROGEN UNDER A PRESSURE OF ABOUT 1900 TO ABOUT 3000 P.S.I., AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 200* TO ABOUT 275* C., IN THE PRESENCE OF AN INERT SOLVENT AND A COPPER-CHROMIUM OXIDE CATALYST, UNTIL HYDROGEN IS NO LONGER ABSORBED.
Claim 4
Dependent Claim
54 words
PROCESS FOR THE PREPARATION OF DECAHYDRODIPYRROLO-(A,D)-PYRAZINE, WHICH COMPRISES REACTING BUTYL PYROGLUTAMATE WITH HYDROGEN UNDER A PRESSURE OF ABOUT 1900 TO ABOUT 3000 P.S.I., AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 200* TO ABOUT 275* C., IN THE PRESENCE OF AN INERT SOLVENT AND A COPPER-CHROMIUM OXIDE CATALYST, UNTIL HYDROGEN IS NO LONGER ABSORBED.
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) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |