US2448620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of hydrogen fluoride by distillation with an olefin
Assignee: Phillips Petroleum Co
•
Filing: 1944-07-17
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Granted: 1948-09-07
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Expires: 1964-07-17
Abstract
No abstract record available.
Inventors
- 👤 George R Reading
- 👤 Roy E Vinyard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:33
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; B; B01; B01J; B01J27/00; B01J27/06; C07C2/00; C07C2/54; C07C2/56; C07C2/58; C07C2/62; C07C2527/00; C07C2527/06; C07C2527/08; C07C2527/12; C07C2527/1206
Claims Analysis
Total Claims: 0
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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) | 1951-09-07 | 1952-03-08 | 1952-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-09-07 | 1956-03-08 | 1956-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-09-07 | 1960-03-08 | 1960-09-07 | $7700.00 | Window Closed / Lapsed |