Patent US2772957A successfully refreshed from Google Patents.
US2772957A
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Method of processing disseminated chromite ores
Assignee: American Chrome Co
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Filing: 1953-11-09
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Granted: 1956-12-04
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Expires: 1973-11-09
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:25
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A PROCESS FOR RESOLVING A COMPLEX ORE WHEREIN DISSEMINATED CHROMITE IS SCATTERED THROUGH A MATRIX COMPOSED OF A COMPLEX METAL SILICATE, THE STEPS CONSISTING IN MIXING THE ORE WITH A SUFFICIENT AMOUNT OF AN AQUEOUS SOLUTION OF AMMONIUM BISULFATE TO DECOMPOSE AND COMBINED WITH SUBSTANTIALLY ALL OF THE METAL PRESENT EXCEPT CHROMIUM, BUT INSUFFICIENT TO REACT WITH THE CHROMITE PRESENT, WHEREBY THERE IS FORMED A MIXTURE OF METAL SULFATES, CHROMITE AND RELEASED SILICA, HEATING THE MIXTURE TO ABOUT 500* F. FOR A PERIOD SUFFICIENT TO DEHYDRATE PARTIALLY THE LIBERATED SILICIA, ADDING WATER TO THE HEATED MIXTURE TO DISSOLVED SOLUBLE METAL SULFATES PRESENT AND PROVIDED A SULFATE SOLUTION AND THE SILICIA AS ONE PHASE AND CHROMITE AS A SOLID PHASE, AND SEPARATING THE TWO PHASES.
Claim 2
Dependent Claim
125 words
IN A PROCESS FOR RESOLVING A COMPLEX ORE WHEREIN DISSEMINATED CHROMITE IS SCATTERED THROUGH A MATRIX COMPOSED OF A COMPLEX METAL SILICATE, THE STEPS CONSISTING IN MIXING THE ORE WITH A SUFFICIENT AMOUNT OF AN AQUEOUS SOLUTION OF AMMONIUM BISULFATE TO DECOMPOSE AND COMBINED WITH SUBSTANTIALLY ALL OF THE METAL PRESENT EXCEPT CHROMIUM, BUT INSUFFICIENT TO REACT WITH THE CHROMITE PRESENT, WHEREBY THERE IS FORMED A MIXTURE OF METAL SULFATES, CHROMITE AND RELEASED SILICA, HEATING THE MIXTURE TO ABOUT 500* F. FOR A PERIOD SUFFICIENT TO DEHYDRATE PARTIALLY THE LIBERATED SILICIA, ADDING WATER TO THE HEATED MIXTURE TO DISSOLVED SOLUBLE METAL SULFATES PRESENT AND PROVIDED A SULFATE SOLUTION AND THE SILICIA AS ONE PHASE AND CHROMITE AS A SOLID PHASE, AND SEPARATING THE TWO PHASES.
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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) | 1959-12-04 | 1960-06-04 | 1960-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-04 | 1964-06-04 | 1964-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-04 | 1968-06-04 | 1968-12-04 | $7700.00 | Window Closed / Lapsed |