Patent US3000725A successfully refreshed from Google Patents.
US3000725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical concentration of manganese
Assignee: Tholand Inc
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Filing: 1958-02-27
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Granted: 1961-09-19
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Expires: 1978-02-27
Abstract
No abstract record available.
Inventors
- 👤 Lofquist Karl Helge Sigfrid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:15
CPC Classifications
C; C22; C22B; C22B47/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR CONCENTRATING MANGANESE OF AN ALLOY ESSENTIALLY COMPOSED OF A MAJOR PROPORATION OF IRON, SAID ALLOY CONTAINING AT LEAST 10% BY WEIGHT OF MANGANESE, WHICH COMPRISES ESTABLISHING A MELT OF SAID ALLOY CONTAINING FROM 1% TO 3% BY WEIGHT OF SILICON AND INTRODUCING INTO SAID MELT BELOW THE SURFACE THEREOF A FINELY DIVIDED FERROUS METAL SULFATE TO PRODUCE A RELATIVELY FLUID SLAG WHICH IS COMPOSED PREDOMINANTLY OF MANGANESE OXIDE AND MANGANESE SULFIDE WITH A SMALL AMOUNT OF SILICA.
Claim 2
Dependent Claim
80 words
A PROCESS FOR CONCENTRATING MANGANESE OF AN ALLOY ESSENTIALLY COMPOSED OF A MAJOR PROPORATION OF IRON, SAID ALLOY CONTAINING AT LEAST 10% BY WEIGHT OF MANGANESE, WHICH COMPRISES ESTABLISHING A MELT OF SAID ALLOY CONTAINING FROM 1% TO 3% BY WEIGHT OF SILICON AND INTRODUCING INTO SAID MELT BELOW THE SURFACE THEREOF A FINELY DIVIDED FERROUS METAL SULFATE TO PRODUCE A RELATIVELY FLUID SLAG WHICH IS COMPOSED PREDOMINANTLY OF MANGANESE OXIDE AND MANGANESE SULFIDE WITH A SMALL AMOUNT OF SILICA.
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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |