US3663382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovering hydrogen fluoride free of arsenic by distillation
Assignee: EIDP Inc
•
Filing: 1969-08-19
•
Granted: 1972-05-16
•
Expires: 1989-08-19
Abstract
Abstract Anhydrous hydrogen fluoride containing less than about 3,000 parts per billion of arsenic is produced by distilling hydrogen fluoride at a pressure below 25 pounds per square inch absolute.
Inventors
- 👤 George J Garris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:33
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/195; C01B7/196
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
24 words
A process of claim 1 wherein the liquified arsenic-containing hydrogen fluoride is distilled at a pressure between 10 mm Hg and 776 mm Hg.
References Cited (Backward Citations)
US3166379A
Cited
US3167391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |