Patent US2449427A successfully refreshed from Google Patents.
US2449427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foam prevention in extractive distillation of hydrocarbons with furfural solvent
Assignee: Phillips Petroleum Co
•
Filing: 1944-07-28
•
Granted: 1948-09-14
•
Expires: 1964-07-28
Abstract
No abstract record available.
Inventors
- 👤 Thodos George
- 👤 Charles F Weinaug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:11
CPC Classifications
C; C07; C07C; C07C11/00; C07C7/00; C07C7/04; C07C7/05; C07C7/08; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/40; C07D307/46; C07D307/48
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-09-14 | 1952-03-15 | 1952-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-14 | 1956-03-15 | 1956-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-14 | 1960-03-15 | 1960-09-14 | $7700.00 | Window Closed / Lapsed |