Patent US2636050A successfully refreshed from Google Patents.
US2636050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of methanol from methyl acetate by extractive distillation with ethylene glycol
Assignee: Union Carbide Corp
•
Filing: 1951-05-03
•
Granted: 1953-04-21
•
Expires: 1971-05-03
Abstract
No abstract record available.
Inventors
- 👤 Raymond I Hoaglin
- 👤 Jr Walter M Frankenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:48
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/84; C07C67/00; C07C67/48; C07C67/58
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2251215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |