US3139336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper refining
Assignee: Individual
•
Filing: 1961-05-11
•
Granted: 1964-06-30
•
Expires: 1981-05-11
Abstract
No abstract record available.
Inventors
- 👤 Mattie M Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:24
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/006; C22B15/0028; C22B15/003; C22B15/0041
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS OF PRODUCING COPPER IN A CONVERTER IN WHICH THE IMPURITIES ARE ABSORBED INTO A SILICA BLANKET BY ADDING SILICA NEAR THE END OF THE USUAL AIR BLOW AND CONTINUING THE SAID AIR BLOW SEVERAL MINUTES TO FORM THE BLANKET, THE IMPROVEMENT IN COMBINATION THEREWITH WHICH CONSISTS IN SUBSTANTIALLY COMPLETELY SUBSTITUTING INERT GAS FOR AIR AT ABOUT THE TIME THE SILICA IS ADDED AND CONTINUING THE BLOW WITH SAID INERT GAS FOR SEVERAL MINUTES TO FORM THE BLANKET, AND POURING THE PURIFIED COPPER FROM UNDER THE BLANKET.
Claim 2
Dependent Claim
89 words
IN A PROCESS OF PRODUCING COPPER IN A CONVERTER IN WHICH THE IMPURITIES ARE ABSORBED INTO A SILICA BLANKET BY ADDING SILICA NEAR THE END OF THE USUAL AIR BLOW AND CONTINUING THE SAID AIR BLOW SEVERAL MINUTES TO FORM THE BLANKET, THE IMPROVEMENT IN COMBINATION THEREWITH WHICH CONSISTS IN SUBSTANTIALLY COMPLETELY SUBSTITUTING INERT GAS FOR AIR AT ABOUT THE TIME THE SILICA IS ADDED AND CONTINUING THE BLOW WITH SAID INERT GAS FOR SEVERAL MINUTES TO FORM THE BLANKET, AND POURING THE PURIFIED COPPER FROM UNDER THE BLANKET.
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) | 1967-06-30 | 1967-12-30 | 1968-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-30 | 1971-12-30 | 1972-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-30 | 1975-12-30 | 1976-06-30 | $7700.00 | Window Closed / Lapsed |