Patent CH526893A successfully refreshed from Google Patents.
Patent US1822358A successfully refreshed from Google Patents.
US1822358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of separating ethylene from the higher homologues thereof in gaseous mixtures containing olefines
Assignee: IG Farbenindustrie AG
•
Filing: 1929-03-18
•
Granted: 1931-09-08
•
Expires: 1949-03-18
Abstract
No abstract record available.
Inventors
- 👤 Michel Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:43
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/14833; C07C7/1485
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) | 1934-09-07 | 1935-03-09 | 1935-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-09-07 | 1939-03-09 | 1939-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-09-07 | 1943-03-09 | 1943-09-08 | $7700.00 | Window Closed / Lapsed |