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Patent US2656282A successfully refreshed from Google Patents.
US2656282A
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Method for the production of iron oxide from ferrous solutions
Assignee: Wheatland Tube Co
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Filing: 1951-01-26
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Granted: 1953-10-20
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Expires: 1971-01-26
Abstract
No abstract record available.
Inventors
- 👤 Clarke Charles Curtis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:56
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06; C01P; C01P2006/00; C01P2006/60; Y; Y10; Y10S; Y10S423/00; Y10S423/01; Y10S423/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF PRODUCING A DARK BROWN IRON OXIDE WITH RED-BLACK UNDERTONE FROM AN IMPURE LIQUOR HAVING A FERROUS CONTENT WHICH COMPRISES ADJUSTING THE PH OF THE IMPURE LIQUOR TO WITHIN THE RANGE PH 2-PH 6 UNTIL A CRUD IS FORMED, SEPARATING THE CRUD, ADJUSTING THE PH OF THE RESIDUAL LIQUOR TO ABOUT 9.6, ELEVATING THE TEMPERATURE OF THE LIQUOR TO ABOUT 200* F., INTRODUCING AN OXIDIZING GAS INTO THE LIQUOR WHILE MAINTAINING PRESSURE ON THE LIQUOR OF ABOUT 30 POINTS PER SQUARE INCH UNTIL CONVERSION OF THE FERROUS CONTENT OF THE LIQUOR TO HIGHER IRON OXIDES IS COMPLETED, WASHING THE IRON OXIDES AND DRYING.
Claim 2
Independent Claim
105 words
THE METHOD OF PRODUCING A DARK BROWN IRON OXIDE WITH RED-BLACK UNDERTONE FROM AN IMPURE LIQUOR HAVING A FERROUS CONTENT WHICH COMPRISES ADJUSTING THE PH OF THE IMPURE LIQUOR TO WITHIN THE RANGE PH 2-PH 6 UNTIL A CRUD IS FORMED, SEPARATING THE CRUD, ADJUSTING THE PH OF THE RESIDUAL LIQUOR TO ABOUT 9.6, ELEVATING THE TEMPERATURE OF THE LIQUOR TO ABOUT 200* F., INTRODUCING AN OXIDIZING GAS INTO THE LIQUOR WHILE MAINTAINING PRESSURE ON THE LIQUOR OF ABOUT 30 POINTS PER SQUARE INCH UNTIL CONVERSION OF THE FERROUS CONTENT OF THE LIQUOR TO HIGHER IRON OXIDES IS COMPLETED, WASHING THE IRON OXIDES AND DRYING.
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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) | 1956-10-19 | 1957-04-20 | 1957-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-19 | 1961-04-20 | 1961-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-19 | 1965-04-20 | 1965-10-20 | $7700.00 | Window Closed / Lapsed |