US2762686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of calcium carbonate in molten bath of alkali metal carbonates and hydroxides
Assignee: Sinclair Manufacturing Co
•
Filing: 1955-02-21
•
Granted: 1956-09-11
•
Expires: 1975-02-21
Abstract
No abstract record available.
Inventors
- 👤 George L Cunningham
- 👤 Jr John M Finn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:33
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18; C01F11/185; C09; C09C; C09C1/00; C09C1/02; C09C1/021; C09C1/022; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS FOR PURIFYING CALCIUM CARBONATE WHICH COMPRISES: CONTACTING AN IMPURE CALCIUM CARBONATE WITH A MOLTEN BATH OF AT LEAST ONE ALKALI METAL COMPOUND FROM THE GROUP CONSISTING OF ALKALI METAL CARBONATES AND ALKALI METAL HYDROXIDES, MAINTAINING THE SO-FORMED MIXTURE AT AN ELEVATED TEMPERATURE TO DISSOLVE THE CALCIUM CARBONATE, DECANTING THE SOLUBLE PORTION OF THE FUSED METAL INTO AN AMOUNT OF WATER AT LEAST SUFFICIENT TO DISSOLVE THE ALKALI METAL COMPOUNDS PERSENT AND INSUFFICIENT TO DISSOLVE AN APPRICIABLE PORTION OF THE CALCIUM CARBONATE, WHEREBY THE ALKALI METAL COMPOUNDS PRESENT ARE DISSOLVED AND THE CALCIUM CARBONATE IS PRECIPITATED AND SEPARATING THE PRECIPITATED CALCIUM CARBONATE FROM THE AQUEOUS PORTION THEREBY RECOVERING THE CALCIUM CARBONATE AS A PURE FINELY DIVIDED SOLID.
Claim 2
Dependent Claim
118 words
A PROCESS FOR PURIFYING CALCIUM CARBONATE WHICH COMPRISES: CONTACTING AN IMPURE CALCIUM CARBONATE WITH A MOLTEN BATH OF AT LEAST ONE ALKALI METAL COMPOUND FROM THE GROUP CONSISTING OF ALKALI METAL CARBONATES AND ALKALI METAL HYDROXIDES, MAINTAINING THE SO-FORMED MIXTURE AT AN ELEVATED TEMPERATURE TO DISSOLVE THE CALCIUM CARBONATE, DECANTING THE SOLUBLE PORTION OF THE FUSED METAL INTO AN AMOUNT OF WATER AT LEAST SUFFICIENT TO DISSOLVE THE ALKALI METAL COMPOUNDS PERSENT AND INSUFFICIENT TO DISSOLVE AN APPRICIABLE PORTION OF THE CALCIUM CARBONATE, WHEREBY THE ALKALI METAL COMPOUNDS PRESENT ARE DISSOLVED AND THE CALCIUM CARBONATE IS PRECIPITATED AND SEPARATING THE PRECIPITATED CALCIUM CARBONATE FROM THE AQUEOUS PORTION THEREBY RECOVERING THE CALCIUM CARBONATE AS A PURE FINELY DIVIDED SOLID.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |