Patent US3166379A successfully refreshed from Google Patents.
US3166379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of hydrofluoric acid
Assignee: Union Carbide Corp
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Filing: 1962-06-04
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Granted: 1965-01-19
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Expires: 1982-06-04
Abstract
No abstract record available.
Inventors
- 👤 Howard B Bradley
- 👤 Robert G Pankhurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:56
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
46 words
A PROCESS FOR REMOVING PHOSPHORUS IMPURITIES FROM HYDROFLUORIC ACID WHICH COMPRISES CONTACTING THE HYDROFLUORIC ACID WITH A HALOGEN SELECTED FROM THE GROUP CONSISTING OF IODINE, BROMINE AND CHLORINE TO FORM HIGH-BOILING POINT HALOGEN-IMPURITY COMPOUNDS, AND THEN SEPARATING SUCH HIGH-BOILING POINT HALOGEN-IMPURITY COMPOUNDS FROM THE HYDROFLUORIC ACID.
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) | 1968-01-19 | 1968-07-20 | 1969-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-19 | 1972-07-20 | 1973-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-19 | 1976-07-20 | 1977-01-19 | $7700.00 | Window Closed / Lapsed |