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Patent US3116974A successfully refreshed from Google Patents.
US3116974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of magnesia
Assignee: Individual
•
Filing: 1961-06-19
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Granted: 1964-01-07
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Expires: 1981-06-19
Abstract
No abstract record available.
Inventors
- 👤 William L Nikolai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:57
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/14; C01F5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
A PROCESS FOR SEPARATING MAGNESIUM AND CALCIUM IN A MINERAL MASS CONTAINING CALCIUM HYDROXIDE, MAGNESIUM HYDROXIDE AND MAGNESIUM OXIDE WHICH PROCESS COMPRISES FORMING AN AQUEOUS SLURRY OF SAID CALCIUM HYDROXIDE, MAGNESIUM HYDROXIDE AND MAGNESIUM OXIDE, DECREASING THE PH OF SAID SLURRY BY THE ADDITION OF AN ACID WHICH FORMS 3 SOLUBLE CALCIUM COMPOUND, DETERMINING THE POINT WHERE THE RATE OF CHANGE OF PH SUBSTANTIALLY INCREASES, TERMINATING THE ACID ADDITION OF ABOUT SUCH POINT, AND SEPARATING THE AQUEOUS SOLUTION SAID SLURRY FROM THE SOLIDS OF SAID SLURRY.
Claim 2
Dependent Claim
86 words
A PROCESS FOR SEPARATING MAGNESIUM AND CALCIUM IN A MINERAL MASS CONTAINING CALCIUM HYDROXIDE, MAGNESIUM HYDROXIDE AND MAGNESIUM OXIDE WHICH PROCESS COMPRISES FORMING AN AQUEOUS SLURRY OF SAID CALCIUM HYDROXIDE, MAGNESIUM HYDROXIDE AND MAGNESIUM OXIDE, DECREASING THE PH OF SAID SLURRY BY THE ADDITION OF AN ACID WHICH FORMS 3 SOLUBLE CALCIUM COMPOUND, DETERMINING THE POINT WHERE THE RATE OF CHANGE OF PH SUBSTANTIALLY INCREASES, TERMINATING THE ACID ADDITION OF ABOUT SUCH POINT, AND SEPARATING THE AQUEOUS SOLUTION SAID SLURRY FROM THE SOLIDS OF SAID SLURRY.
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) | 1967-01-06 | 1967-07-08 | 1968-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-06 | 1971-07-08 | 1972-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-06 | 1975-07-08 | 1976-01-07 | $7700.00 | Window Closed / Lapsed |