Patent US5197186A successfully refreshed from Google Patents.
Patent US3415742A successfully refreshed from Google Patents.
US3415742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of aromatics by extraction with solvent mixture of n-methyl-pyrrolidone andglycerol
Assignee: GEA Group AG
•
Filing: 1967-12-20
•
Granted: 1968-12-10
•
Expires: 1987-12-20
Abstract
No abstract record available.
Inventors
- 👤 Eisenlohr Karl-Heinz
- 👤 Muller Eckart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:17
CPC Classifications
C; C10; C10G; C10G21/00; C10G21/06; C10G21/12; C10G21/20; B; B01; B01D; B01D11/00; B01D11/04; B01D11/0488; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C07C7/10; C10G21/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1971-12-10 | 1972-06-10 | 1972-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-10 | 1976-06-10 | 1976-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-10 | 1980-06-10 | 1980-12-10 | $7700.00 | Window Closed / Lapsed |