US3456792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recovering chalcopyrite and pyrite from complex magnetite ores
Assignee: Bethlehem Steel Corp
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Filing: 1966-03-07
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Granted: 1969-07-22
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Expires: 1986-03-07
Abstract
No abstract record available.
Inventors
- 👤 John L Schoolcraft
- 👤 William M Aubrey Jr
- 👤 William H Moyer Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:49
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D1/002; B03D2201/00; B03D2201/02; B03D2201/06; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1554220A
Cited
US1722598A
Cited
US1728352A
Cited
US1893517A
Cited
GB401720A
Cited
US2403640A
Cited
US3220551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |