Patent US3825419A successfully refreshed from Google Patents.
US3825419A
Expired / Lapsed
US
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Beneficiation of titaniferous ores
Assignee: Kerr McGee Chemical Corp
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Filing: 1971-07-19
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Granted: 1974-07-23
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Expires: 1991-07-19
Abstract
Abstract DURING THE BENEFICIATION OF TITANIFEROUS IRON ORES BY LEACHING THEREOF IN A VESSEL WITH ABOUT 20% LIQUID HYDROCHLORIC ACID, THE REQUIRED HEAT IS SUPPLIED BY INTRODUCING ABOUT 20% HYDROCHLORIC ACID VAPOR INTO THE VESSEL AS THE SOLE HEAT EXCHANGE MEDIUM.
Inventors
- 👤 J Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:51
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; C22B34/1213
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |