US3128152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering hydrogen fluoride from aqueous fluosilicic acid solution
Assignee: Cabot Corp
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Filing: 1961-10-10
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Granted: 1964-04-07
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Expires: 1981-10-10
Abstract
No abstract record available.
Inventors
- 👤 Robert N Secord
- 👤 Carpenter Clifford Le Roy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:17
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/194; C01B7/193
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PROCESS FOR RECOVERING HYDROGEN FLUORIDE FROM FLUOSILICIC ACID WHICH COMPRISES REACTING AN AQUEOUS SOLUTION OF FLUOSILICIC ACID WITH AMMONIA AND RECOVERING AN AMMONIUM FLUORIDE SOLUTION FROM THE RESULTING PRODUCTS, EVAPORATING SAID AMMONIUM FLUORIDE SOLUTION TO PRODUCE HYDROGEN AMMONIUM DIFLUORIDE AND AMMONIA, OXIDIZING SAID HYDROGEN AMMONIUM DIFLUORIDE WITH A SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF OXYGEN AND OXYGENCONTAINING GAS, AND RECOVERING THE HYDROGEN FLUORIDE PRODUCED BY SAID OXIDATION REACTION.
Claim 2
Dependent Claim
70 words
A PROCESS FOR RECOVERING HYDROGEN FLUORIDE FROM FLUOSILICIC ACID WHICH COMPRISES REACTING AN AQUEOUS SOLUTION OF FLUOSILICIC ACID WITH AMMONIA AND RECOVERING AN AMMONIUM FLUORIDE SOLUTION FROM THE RESULTING PRODUCTS, EVAPORATING SAID AMMONIUM FLUORIDE SOLUTION TO PRODUCE HYDROGEN AMMONIUM DIFLUORIDE AND AMMONIA, OXIDIZING SAID HYDROGEN AMMONIUM DIFLUORIDE WITH A SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF OXYGEN AND OXYGENCONTAINING GAS, AND RECOVERING THE HYDROGEN FLUORIDE PRODUCED BY SAID OXIDATION REACTION.
References Cited (Backward Citations)
US2426557A
Cited
US2981601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |