Patent US2809105A successfully refreshed from Google Patents.
US2809105A
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Method of treating mayaritype iron ore
Assignee: Bethlehem Steel Corp
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Filing: 1954-12-24
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Granted: 1957-10-08
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Expires: 1974-12-24
Abstract
No abstract record available.
Inventors
- 👤 Edgar B Mancke
- 👤 Sidney V Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:50
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/04; C22B3/06; C22B1/00; C22B1/02; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS FOR TREATING MAYARI TYPE IRON ORE TO REMOVE CHROMIUM COMPRISING THE STEPS OF ROASTING THE ORE WITH AN ALKALI METAL COMPOUND OF THE GROUP CONSISTING OF HYDROXIDE, CARBONATE, AND BICARBONATE, WASHING THE ORE WITH WATER TO REMOVE CHROMIUM AND ALKALI, AND ADDING A CALCIUM COMPOUND OF THE GROUP CONSISTING OF OXIDE AND HYDROXIDE DURING SUCH WASHING TO FACILITATE THE REMOVAL OF ALKALI.
Claim 2
Dependent Claim
64 words
A PROCESS FOR TREATING MAYARI TYPE IRON ORE TO REMOVE CHROMIUM COMPRISING THE STEPS OF ROASTING THE ORE WITH AN ALKALI METAL COMPOUND OF THE GROUP CONSISTING OF HYDROXIDE, CARBONATE, AND BICARBONATE, WASHING THE ORE WITH WATER TO REMOVE CHROMIUM AND ALKALI, AND ADDING A CALCIUM COMPOUND OF THE GROUP CONSISTING OF OXIDE AND HYDROXIDE DURING SUCH WASHING TO FACILITATE THE REMOVAL OF ALKALI.
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) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |