US3268387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of calcium carbonate
Assignee: Magnera Corp
•
Filing: 1963-08-20
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Granted: 1966-08-23
•
Expires: 1983-08-20
Abstract
No abstract record available.
Inventors
- 👤 Casciani Ferri
- 👤 Harry D Bauman
- 👤 Roger S Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:34
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/18; C01F11/181
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
103 words
A CONTINUOUS PROCESS FOR PREPARING CALCIUM CARBONATE COMPRISING THE STEPS OF (1) PRETREATING A SLURRY OF CALCIUM HYDROXIDE IN WATER WITH A CARBON DIOXIDECONTAINING GAS TO REACT SAID CARBON DIOXIDE WITH A PORTION OF SAID CALCIUM HYDROXIDE TO INITIATE A CONVERSION OF SAID CALCIUM HYDROXIDE TO CALCIUM CARBONATE, (2) SEPARATING FLUID FROM THE RESULTING PRETREATED SLURRY TO FORM A FILTER CAKE, (3) CONTACTING SAID CAKE WITH AN AQUEOUS SOLUTION CONTAINING AN ALKALI METAL CARBONATE TO SUBSTANTIALLY COMPLETE THE CONVERSION OF SAID CALCIUM HYDROXIDE TO CACO3 AND FORM ALKALI METAL HYDROXIDE, AND (4) REMOVING ALKALI META HYDROXIDE FROM SAID CAKE DURING SAID CONTACTING STEP.
Claim 2
Dependent Claim
103 words
A CONTINUOUS PROCESS FOR PREPARING CALCIUM CARBONATE COMPRISING THE STEPS OF (1) PRETREATING A SLURRY OF CALCIUM HYDROXIDE IN WATER WITH A CARBON DIOXIDECONTAINING GAS TO REACT SAID CARBON DIOXIDE WITH A PORTION OF SAID CALCIUM HYDROXIDE TO INITIATE A CONVERSION OF SAID CALCIUM HYDROXIDE TO CALCIUM CARBONATE, (2) SEPARATING FLUID FROM THE RESULTING PRETREATED SLURRY TO FORM A FILTER CAKE, (3) CONTACTING SAID CAKE WITH AN AQUEOUS SOLUTION CONTAINING AN ALKALI METAL CARBONATE TO SUBSTANTIALLY COMPLETE THE CONVERSION OF SAID CALCIUM HYDROXIDE TO CACO3 AND FORM ALKALI METAL HYDROXIDE, AND (4) REMOVING ALKALI META HYDROXIDE FROM SAID CAKE DURING SAID CONTACTING STEP.
Claim 3
Dependent Claim
120 words
A CONTINUOUS PROCESS FOR PRODUCING CALCIUM CARBONATE COMPRISING THE STEPS OF (1) CONTINUOUSLY MOVING A SLURRY OF CALCIUM HYDROXIDE THROUGH A REACTION ZONE, (2) CONTINUOUSLY FEEDING A CARBON DIOXIDE-CONTAINING GAS TO SAID REACTION ZONE TO REACT SAID CARBON DIOXIDE WITH A PORTION OF CALCIUUM HYDROXIDE TO CONVERT NOT MORE THAN 85 PERCENT OF SAID CALCIUM HYDROXIDE TO CALCIUM CARBNATE, (3) CONTINUOUSLY SEPARATING FLUID FROM THE RESULTING PRETREATED SLURRY TO FORM A FILTER CAKE, (4) CONTINUOUSLY CONTACTING SAID CAKE AS IT IS FORMED WITH AN AQUEOUS SOLUTION CONTAINING AN ALKALI METAL CARBONATE TO SUBSTANTIALLY COMPLETE THE CONVERSION OF SAID CALCIUM HYDROXIDE TO CALCIUM CARBONATE AND FORM ALKALI METAL HYDROXIDE, AND REMOVING ALKALI METAL HYDROXIDE FROM SAID CAKE DURING SAID CONTACTING STEP.
Claim 4
Dependent Claim
120 words
A CONTINUOUS PROCESS FOR PRODUCING CALCIUM CARBONATE COMPRISING THE STEPS OF (1) CONTINUOUSLY MOVING A SLURRY OF CALCIUM HYDROXIDE THROUGH A REACTION ZONE, (2) CONTINUOUSLY FEEDING A CARBON DIOXIDE-CONTAINING GAS TO SAID REACTION ZONE TO REACT SAID CARBON DIOXIDE WITH A PORTION OF CALCIUUM HYDROXIDE TO CONVERT NOT MORE THAN 85 PERCENT OF SAID CALCIUM HYDROXIDE TO CALCIUM CARBNATE, (3) CONTINUOUSLY SEPARATING FLUID FROM THE RESULTING PRETREATED SLURRY TO FORM A FILTER CAKE, (4) CONTINUOUSLY CONTACTING SAID CAKE AS IT IS FORMED WITH AN AQUEOUS SOLUTION CONTAINING AN ALKALI METAL CARBONATE TO SUBSTANTIALLY COMPLETE THE CONVERSION OF SAID CALCIUM HYDROXIDE TO CALCIUM CARBONATE AND FORM ALKALI METAL HYDROXIDE, AND REMOVING ALKALI METAL HYDROXIDE FROM SAID CAKE DURING SAID CONTACTING STEP.
References Cited (Backward Citations)
US2105503A
Cited
GB562544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |