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US2425752A
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Separation of hydrogen fluoride from water and organic contaminants by distillation and decantation
Assignee: Phillips Petroleum Co
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Filing: 1944-09-15
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Granted: 1947-08-19
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Expires: 1964-09-15
Abstract
No abstract record available.
Inventors
- 👤 George E Mckenna
- 👤 George R Hettick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:26
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/06; C; C07; C07C; C07C15/00; C07C15/02
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) | 1950-08-18 | 1951-02-17 | 1951-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-08-18 | 1955-02-17 | 1955-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-08-18 | 1959-02-17 | 1959-08-19 | $7700.00 | Window Closed / Lapsed |