US1679256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purifying organic liquid
Assignee: IG Farbenindustrie AG
•
Filing: 1925-08-17
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Granted: 1928-07-31
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Expires: 1945-08-17
Abstract
No abstract record available.
Inventors
- 👤 Muller Carl
- 👤 Frankenburger Walter
- 👤 Grassner Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:21
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/15; C07C29/151; C07C45/00; C07C45/78; C07C45/85; C07C51/00; C07C51/42; C07C51/487
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) | 1931-07-31 | 1932-01-30 | 1932-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-07-31 | 1936-01-30 | 1936-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-07-31 | 1940-01-30 | 1940-07-31 | $7700.00 | Window Closed / Lapsed |