US3071437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of hydrogen fluoride
Assignee: EIDP Inc
•
Filing: 1959-08-19
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Granted: 1963-01-01
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Expires: 1979-08-19
Abstract
No abstract record available.
Inventors
- 👤 Charles C Quarles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:19
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/192
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
IN A PROCESS FOR THE PREPARATION OF HYDROGEN FLUORIDE, THE STEPS COMPRISING (1) MAKING A SLURRY OF CALCIUM FLUORIDE IN LIQUID HYDROGEN FLUORIDE AND (2) REACTING SAID CALCIUM FLUORIDE WITH SULFURIC ACID AT A TEMPERATURE WITHIN THE RANGE BETWEEN ABOUT 100 AND 230*C. AND A PRESSURE SUFFICIENT TO KEEP HYDROGEN FLUORIDE IN A LIQUID STATE.
Claim 2
Dependent Claim
55 words
IN A PROCESS FOR THE PREPARATION OF HYDROGEN FLUORIDE, THE STEPS COMPRISING (1) MAKING A SLURRY OF CALCIUM FLUORIDE IN LIQUID HYDROGEN FLUORIDE AND (2) REACTING SAID CALCIUM FLUORIDE WITH SULFURIC ACID AT A TEMPERATURE WITHIN THE RANGE BETWEEN ABOUT 100 AND 230*C. AND A PRESSURE SUFFICIENT TO KEEP HYDROGEN FLUORIDE IN A LIQUID STATE.
References Cited (Backward Citations)
US2846290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |