US2702233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of hydrogen fluoride
Assignee: Pennsylvania Salt Manufacturing Co
•
Filing: 1949-08-13
•
Granted: 1955-02-15
•
Expires: 1969-08-13
Abstract
No abstract record available.
Inventors
- 👤 William F Mitchell
- 👤 John A Grant-Mackay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:51
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/192
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
60 words
A METHOD OF MAKING SUBSTANTIALLY ANHYDROUS HYDROGEN FLUORIDE COMPRISING HYDROLYZING IN SUCCESSIVE STAGES TO LIQUID FLUOSULFONIC ACID TO FORM SULFURIC ACID AND HYDROGEN FLUORIDE AND REMOVING HYDROGEN FLUORIDE AS FORMED FROM EACH STEPWISE ADDITION OF WATER, THE AMOUNT OF SAID WATER USED IN ANY OF SUCH STAGES BEING LESS THAN THAT NECESSARY TO COMPLETE THE DECOMPOSITION OF THE FLUOSULFONIC 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) | 1958-02-14 | 1958-08-16 | 1959-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-14 | 1962-08-16 | 1963-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-14 | 1966-08-16 | 1967-02-15 | $7700.00 | Window Closed / Lapsed |