Patent US2943092A successfully refreshed from Google Patents.
US2943092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing 4-amino-3-isoxazolidinones
Assignee: Individual
•
Filing: 1957-04-23
•
Granted: 1960-06-28
•
Expires: 1977-04-23
Abstract
No abstract record available.
Inventors
- 👤 Smrt Jiri
- 👤 Beranek Jiri
- 👤 Sicher Jiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:03
CPC Classifications
C; C07; C07D; C07D261/00; C07D261/02; C07D261/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
30 words
IN A METHOD OF PREPARING A BLOCKED BETA-ACIDO PROPIONHYDROXAMIC ACID AND ITS CYCLIZATION IN THE PRESENCE OF A BASIC AGENT TO FORM THE CORRESPONDING 4-AMINO-3ISOXAZOLIDINONE HAVING THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
30 words
IN A METHOD OF PREPARING A BLOCKED BETA-ACIDO PROPIONHYDROXAMIC ACID AND ITS CYCLIZATION IN THE PRESENCE OF A BASIC AGENT TO FORM THE CORRESPONDING 4-AMINO-3ISOXAZOLIDINONE HAVING THE FOLLOWING GENERAL FORMULA:
References Cited (Backward Citations)
US2772280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-28 | 1963-12-28 | 1964-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-28 | 1967-12-28 | 1968-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-28 | 1971-12-28 | 1972-06-28 | $7700.00 | Window Closed / Lapsed |