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US2485070A
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Inhibiting polymerization of furfural in extractive distillation
Assignee: Phillips Petroleum Co
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Filing: 1945-03-26
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Granted: 1949-10-18
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Expires: 1965-03-26
Abstract
No abstract record available.
Inventors
- 👤 Walter A Schulze
- 👤 John C Hillyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:07
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/02; C07D307/34; C07D307/38; C07D307/40; C07D307/46; C07D307/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2241175A
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US2267309A
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US2382207A
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US2388041A
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US2407861A
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US2384238A
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US2404253A
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US2409781A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-17 | 1953-04-18 | 1953-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-17 | 1957-04-18 | 1957-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-17 | 1961-04-18 | 1961-10-18 | $7700.00 | Window Closed / Lapsed |