Patent US2581719A successfully refreshed from Google Patents.
US2581719A
Expired / Lapsed
US
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Obtaining magnesia from magnesiacontaining rock
Assignee: Basic Refractories Inc
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Filing: 1945-01-29
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Granted: 1952-01-08
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Expires: 1965-01-29
Abstract
No abstract record available.
Inventors
- 👤 Robert A Schoenlaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:43
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/24; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS OF THE CHARACTER. DESCRIBED, WHICH COMPRISES SUPPLYING CARBON DIOXIDE T A SLURRY OF CALINED DOLOMITE TO A PH OF ABOUT 10.5, AT A TEMPERATURE PERATURE SUBSTANTIALLY ABOVE 100* F., THEREBY FORMING FINE CALCIUM CARBONATE CRYSTALS, THEN AT A TEMPERATURE NOT HIGHER THAN ABOUT 57* F. SUPPLYING ADDITIONAL CARBOPN DIOXIDE TO THE PARTIALLY CARBONATED SLURRY AND ADDING FRESH PARTIALLY CARBONATED SLURRY IN CONTROLLED AMOUNT FROM THE FIRST CARBONATION FOR REACTION THEREWITH AT SUCH RATES AS TO SELECTIVELY FORM LANSFORDITE CRYSTALS OF RELATIVELY LARGE SIZE AND SEPARATING THE MAG-
Claim 2
Dependent Claim
89 words
A PROCESS OF THE CHARACTER. DESCRIBED, WHICH COMPRISES SUPPLYING CARBON DIOXIDE T A SLURRY OF CALINED DOLOMITE TO A PH OF ABOUT 10.5, AT A TEMPERATURE PERATURE SUBSTANTIALLY ABOVE 100* F., THEREBY FORMING FINE CALCIUM CARBONATE CRYSTALS, THEN AT A TEMPERATURE NOT HIGHER THAN ABOUT 57* F. SUPPLYING ADDITIONAL CARBOPN DIOXIDE TO THE PARTIALLY CARBONATED SLURRY AND ADDING FRESH PARTIALLY CARBONATED SLURRY IN CONTROLLED AMOUNT FROM THE FIRST CARBONATION FOR REACTION THEREWITH AT SUCH RATES AS TO SELECTIVELY FORM LANSFORDITE CRYSTALS OF RELATIVELY LARGE SIZE AND SEPARATING THE MAG-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |