US2952334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of anhydrous hydrofluoric acid
Assignee: Compagnie de Saint Gobain SA
•
Filing: 1959-01-09
•
Granted: 1960-09-13
•
Expires: 1979-01-09
Abstract
No abstract record available.
Inventors
- 👤 Provoost Marguerite
- 👤 Chastel Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:16
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/195; C01B7/196
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A METHOD OF SEPARATING HF FROM DILUTE H2SO4 SOLUTION THAT COMPRISES ADDING HF IN CONCENTRATED H2SO4 TO SAID SOLUTION, EVAPORATING HF FROM SAID SOLUTION, REMOVING HF FROM SAID SOLUTION BY CONTACT WITH A FLOW OF INERT GAS, AND REMOVING THE HF FROM SAID GAS BY CONTACT WITH CONCENTRATED H2SO4.
Claim 2
Independent Claim
49 words
A METHOD OF SEPARATING HF FROM DILUTE H2SO4 SOLUTION THAT COMPRISES ADDING HF IN CONCENTRATED H2SO4 TO SAID SOLUTION, EVAPORATING HF FROM SAID SOLUTION, REMOVING HF FROM SAID SOLUTION BY CONTACT WITH A FLOW OF INERT GAS, AND REMOVING THE HF FROM SAID GAS BY CONTACT WITH CONCENTRATED H2SO4.
References Cited (Backward Citations)
US2781862A
Cited
US2726932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |