US2455803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation process
Assignee: Shell Development Co
•
Filing: 1944-02-11
•
Granted: 1948-12-07
•
Expires: 1964-02-11
Abstract
No abstract record available.
Inventors
- 👤 Gino J Pierotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:34
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2434796A
Cited
US1474216A
Cited
US2162963A
Cited
US2366360A
Cited
US2396302A
Cited
US2290636A
Cited
US2325329A
Cited
US2350584A
Cited
US2360861A
Cited
US2360859A
Cited
US2357028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-07 | 1952-06-07 | 1952-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-07 | 1956-06-07 | 1956-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-07 | 1960-06-07 | 1960-12-07 | $7700.00 | Window Closed / Lapsed |