US2019883A
Expired / Lapsed
US
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Dehydrogenation of hydrogenated heterocyclic compounds
Assignee: IG Farbenindustrie AG
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Filing: 1932-10-31
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Granted: 1935-11-05
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Expires: 1952-10-31
Abstract
No abstract record available.
Inventors
- 👤 Wulff Carl
- 👤 Breuers Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:50
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D209/00; C07D209/56; C07D209/80; C07D209/82; C07D209/86; C07D215/00; C07D215/02; C07D215/04; C07D221/00; C07D221/02; C07D221/04; C07D221/06; C07D221/08; C07D221/10; C07D307/00; C07D307/77; C07D307/91
Claims Analysis
Total Claims: 0
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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) | 1938-11-04 | 1939-05-06 | 1939-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-04 | 1943-05-06 | 1943-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-04 | 1947-05-06 | 1947-11-05 | $7700.00 | Window Closed / Lapsed |