US3118930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of gamma-oxosenecioic acid esters
Assignee: Chugai Pharmaceutical Co Ltd
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Filing: 1959-08-25
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Granted: 1964-01-21
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Expires: 1979-08-25
Abstract
No abstract record available.
Inventors
- 👤 Sisido Keiiti
- 👤 Nozaki Hitosi
- 👤 Tuda Minoru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:23
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/66; C07C69/73
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
102 words
THE PROCESS OF PREPARING A NITRONE WHICH COMPRISES PREPARING A SOLUTION BY DISSOLVING ONE MOLE OF A LOWER ALKYL $-BROMOSENECIOATE IN BENZENE, MIXING ONE MOLE OF ANHYDROUS PYRIDINE WITH THE RESULTING SOLUTION WHILE STIRRING AND COOLING, HEATING THE RESULTANT MIXTURE UNDER REFLUX CONDITIONS UNTIL THE MIXTURE BECOMES RED AND FORMS AN UPPER LAYER AND A LOWE LAYER, COOLING THE MIXTURE, SEPARATELY TREATING THE LOWER LAYER BY ADDING THERETO ONE MOLE OF P-NITROSODIMETHYLANILINE IN AN ALCOHOL SOLUTION UNDER COOLING CONDITIONS, ADDING TO THE ABOVE-TREATED LOWER LAYER A SODIUM HYDROXIDE SOLUTION WHILE STIRRING UNTIL A CRYSTALLINE PRODUCT SEPARATES OUT, AND RECOVERING THE CRYSTALLINE PRODUCT.
Claim 4
Dependent Claim
102 words
THE PROCESS OF PREPARING A NITRONE WHICH COMPRISES PREPARING A SOLUTION BY DISSOLVING ONE MOLE OF A LOWER ALKYL $-BROMOSENECIOATE IN BENZENE, MIXING ONE MOLE OF ANHYDROUS PYRIDINE WITH THE RESULTING SOLUTION WHILE STIRRING AND COOLING, HEATING THE RESULTANT MIXTURE UNDER REFLUX CONDITIONS UNTIL THE MIXTURE BECOMES RED AND FORMS AN UPPER LAYER AND A LOWE LAYER, COOLING THE MIXTURE, SEPARATELY TREATING THE LOWER LAYER BY ADDING THERETO ONE MOLE OF P-NITROSODIMETHYLANILINE IN AN ALCOHOL SOLUTION UNDER COOLING CONDITIONS, ADDING TO THE ABOVE-TREATED LOWER LAYER A SODIUM HYDROXIDE SOLUTION WHILE STIRRING UNTIL A CRYSTALLINE PRODUCT SEPARATES OUT, AND RECOVERING THE CRYSTALLINE PRODUCT.
Claim 5
Dependent Claim
49 words
A PROCESS AS SET FORTH IN CLAIM 2 CINCLUDING THE ADDITIONAL STEPS OF SUSPENDING THE CRYSTALLINE PRODUCT IN ETHER, ADDING TO THE SUSPENSION SULFURIC ACID WHILE STIRRING AND COOLING, REMOVING AN ETHER LAYER FROM THE ACIDIFIED SUSPENSION, AND DISTILLING THE ETHER FROM THE ETHER LAYER TO REMOVE A RESIDUE.
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) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |