Patent US5218536A successfully refreshed from Google Patents.
Patent US2416552A successfully refreshed from Google Patents.
US2416552A
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Conversion of alkylolamides into oxazolines
Assignee: RICHARDS CHEMICAL WORKS Inc
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Filing: 1940-05-29
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Granted: 1947-02-25
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Expires: 1960-05-29
Abstract
No abstract record available.
Inventors
- 👤 Emeric I Valko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:06
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/02; C07D263/08; C07D263/10; C07D263/14
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-02-24 | 1950-08-26 | 1951-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-02-24 | 1954-08-26 | 1955-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-02-24 | 1958-08-26 | 1959-02-25 | $7700.00 | Window Closed / Lapsed |