US2759931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of n-(5-nitro-2-furfurylidene)-3-amino-2-oxazolidone
Assignee: Warner Chilcott Pharmaceuticals Inc
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Filing: 1953-08-10
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Granted: 1956-08-21
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Expires: 1973-08-10
Abstract
No abstract record available.
Inventors
- 👤 Gordon D Drake
- 👤 Kenyon J Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:43
CPC Classifications
C; C07; C07D; C07D413/00; C07D413/02; C07D413/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
THE METHOD OF PREPARING N-(5-NITRO-2-FURFURYLIDENE)-3-AMINO-2-OXAZOLIDONE, WHICH COMPRISES HYDROLYZING-5-NITRO-2-FURALDEHYDE DIACETATE TO PRODUCE 5-NITRO2-FURALDEHYDE AND CAUSING N-(BENZYLIDENE)-3-AMINO-2OXAZOLIDONE TO REACT WITH SAID 5-NITRO-2-FURALDEHYDE IN THE PRESENCE OF A DILUTE MINERAL ACID AND UNDER THE INFLUENCE OF HEAT.
Claim 2
Independent Claim
34 words
THE METHOD OF PREPARING N-(5-NITRO-2-FURFURYLIDENE)-3-AMINO-2-OXAZOLIDONE, WHICH COMPRISES HYDROLYZING-5-NITRO-2-FURALDEHYDE DIACETATE TO PRODUCE 5-NITRO2-FURALDEHYDE AND CAUSING N-(BENZYLIDENE)-3-AMINO-2OXAZOLIDONE TO REACT WITH SAID 5-NITRO-2-FURALDEHYDE IN THE PRESENCE OF A DILUTE MINERAL ACID AND UNDER THE INFLUENCE OF HEAT.
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) | 1959-08-21 | 1960-02-20 | 1960-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-21 | 1964-02-20 | 1964-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-21 | 1968-02-20 | 1968-08-21 | $7700.00 | Window Closed / Lapsed |