Patent US1899582A successfully refreshed from Google Patents.
US1899582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carrying out friedel crafts and similar condensation reactions with nonaromatic compounds
Assignee: IG Farbenindustrie AG
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Filing: 1929-02-28
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Granted: 1933-02-28
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Expires: 1949-02-28
Abstract
No abstract record available.
Inventors
- 👤 Mark Hermann
- 👤 Dunkel Manfred
- 👤 Rokll Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:01
CPC Classifications
C; C07; C07C; C07C45/00; C07C45/45; C07C45/47; C07C45/455
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) | 1936-02-28 | 1936-08-29 | 1937-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-02-28 | 1940-08-29 | 1941-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-02-28 | 1944-08-29 | 1945-02-28 | $7700.00 | Window Closed / Lapsed |