US2631083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of calcium fluoride and silica
Assignee: Godfrey L Cabot Inc
•
Filing: 1952-01-19
•
Granted: 1953-03-10
•
Expires: 1972-01-19
Abstract
No abstract record available.
Inventors
- 👤 George E Engelson
- 👤 Robert N Secord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:41
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01B33/184; C01F; C01F11/00; C01F11/20; C01F11/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR THE PRODUCTION OF HIGH PURITY CALCIUM FLUORIDE AND SILICA FROM SILICEOUS FLUORSPAR WHICH COMPRISES THE STEPS OF REACTING THE FLUORSPAR WITH HYDROFLUORIC ACID, REMOVING THE CALCIUM FLUORIDE PRODUCT FROM THE LIQUID REACTION PRODUCTS, VAPORIZING THE SAID LIQUID PRODUCTS AND HYDROLYZING THE VAPORS THEREOF AT ELEVATED TEMPERATURES, REMOVING THE SILICA PRODUCT FROM THE GASEOUS HYDROLYSIS PRODUCTS, SEPARATING THE HYDROGEN FLUORIDE FROM SAID GASEOUS HYDROLYSIS PRODUCTS, AND RECYCLING AT LEAST A PORTION OF THE RESULTING HYDROFLUORIC ACID FOR REACTION WITH ADDITIONAL SILICEOUS FLUORSPAR.
Claim 2
Dependent Claim
84 words
A PROCESS FOR THE PRODUCTION OF HIGH PURITY CALCIUM FLUORIDE AND SILICA FROM SILICEOUS FLUORSPAR WHICH COMPRISES THE STEPS OF REACTING THE FLUORSPAR WITH HYDROFLUORIC ACID, REMOVING THE CALCIUM FLUORIDE PRODUCT FROM THE LIQUID REACTION PRODUCTS, VAPORIZING THE SAID LIQUID PRODUCTS AND HYDROLYZING THE VAPORS THEREOF AT ELEVATED TEMPERATURES, REMOVING THE SILICA PRODUCT FROM THE GASEOUS HYDROLYSIS PRODUCTS, SEPARATING THE HYDROGEN FLUORIDE FROM SAID GASEOUS HYDROLYSIS PRODUCTS, AND RECYCLING AT LEAST A PORTION OF THE RESULTING HYDROFLUORIC ACID FOR REACTION WITH ADDITIONAL SILICEOUS FLUORSPAR.
References Cited (Backward Citations)
US2535036A
Cited
GB630182A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |