Patent US1944732A successfully refreshed from Google Patents.
US1944732A
Expired / Lapsed
US
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Compounds having hydrogenated ring systems and process of preparing them
Assignee: IG Farbenindustrie AG
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Filing: 1930-01-13
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Granted: 1934-01-23
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Expires: 1950-01-13
Abstract
No abstract record available.
Inventors
- 👤 Diels Otto
- 👤 Alder Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:44
CPC Classifications
C; C07; C07C; C07C61/00; C07C61/16
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) | 1937-01-22 | 1937-07-24 | 1938-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-22 | 1941-07-24 | 1942-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-22 | 1945-07-24 | 1946-01-23 | $7700.00 | Window Closed / Lapsed |