US3701648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of copper from copper ore
Assignee: OI Glass Inc
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Filing: 1970-12-11
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Granted: 1972-10-31
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Expires: 1990-12-11
Abstract
Abstract COPPER METAL IS ADVANTAGEOUSLY OBTANED FORM COPPER SULIFIDE ORES, WITHOUT THE PRODUCTION OF AIR-POLLUTING SO2, BY CONTACTING THE ORE EITHER SIMULTANEOUSLY OR STEP-WISE WITH HYDROGEN AND WATER VAPOR AT A TEMPERATURE FROM ABOUT 700*C., PREFERABLY ABOVE ABOUT 750*C., TO ABOVE THE MELTING POINT OF THE ORE.
Inventors
- 👤 Carl T Ashby
- 👤 James W Berry
- 👤 Archie J Deutschman Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:33
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0002; C22B15/001; C22B15/0021; C22B15/0026; C22B15/0028; C22B15/003; C22B15/0045; C22B15/0052; C22B15/0095; C22B15/0097
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |