US3160473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of hydrogen fluoride and calcium sulphate
Assignee: Honeywell International Inc
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Filing: 1961-04-27
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Granted: 1964-12-08
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Expires: 1981-04-27
Abstract
No abstract record available.
Inventors
- 👤 Curtis B Hayworth
- 👤 Robert H Hutzler
- 👤 Jr Aubrey W Michener
- 👤 Sobel Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:36
CPC Classifications
C; C01; C01B; C01B7/00; C01B7/19; C01B7/191; C01B7/192
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS FOR THE MANUFACTURE OF HYDROGEN FLUORIDE WHICH COMPRISES CALCINING FLUORSPAR IN A SEPARATE ZONE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 800-1300*F. BY PASSING AN OXYGEN-CONTAINING GAS THROUGH SAID SEPARATE ZONE IN DIRECT AND INTIMATE CONTACT WITH A BED OF FLUORSPAR IN SAID ZONE TO MAINTAIN THE BED IN A FLUIDIZED STATE, PASSING THE HEATED, CALCINED FLUORSPAR INTO AN EXTERNALLY HEATED SEPARATE REACTION ZONE, CONCURRENTLY INTRODUCING SULFURIC ACID IN AT LEAST STIOCHIOMETRIC AMOUNT FOR REACTION WITH THE FLUORSPAR INTO THE EXTERNALLY HEATED REACTION ZONE IN ADMIXTURE WITH THE FLUORSPAR, MAINTAINING THE REACTION MIXTURE IN THE REACTION ZONE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 300-600*F. TO EFFECT REACTION OF THE SULFURIC ACID AND FLUORSPAR TO PRODUCE HY-
Claim 2
Dependent Claim
121 words
A PROCESS FOR THE MANUFACTURE OF HYDROGEN FLUORIDE WHICH COMPRISES CALCINING FLUORSPAR IN A SEPARATE ZONE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 800-1300*F. BY PASSING AN OXYGEN-CONTAINING GAS THROUGH SAID SEPARATE ZONE IN DIRECT AND INTIMATE CONTACT WITH A BED OF FLUORSPAR IN SAID ZONE TO MAINTAIN THE BED IN A FLUIDIZED STATE, PASSING THE HEATED, CALCINED FLUORSPAR INTO AN EXTERNALLY HEATED SEPARATE REACTION ZONE, CONCURRENTLY INTRODUCING SULFURIC ACID IN AT LEAST STIOCHIOMETRIC AMOUNT FOR REACTION WITH THE FLUORSPAR INTO THE EXTERNALLY HEATED REACTION ZONE IN ADMIXTURE WITH THE FLUORSPAR, MAINTAINING THE REACTION MIXTURE IN THE REACTION ZONE AT A TEMPERATURE WITHIN THE RANGE OF ABOUT 300-600*F. TO EFFECT REACTION OF THE SULFURIC ACID AND FLUORSPAR TO PRODUCE HY-
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) | 1967-12-08 | 1968-06-08 | 1968-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-08 | 1972-06-08 | 1972-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-08 | 1976-06-08 | 1976-12-08 | $7700.00 | Window Closed / Lapsed |