Patent US3256173A successfully refreshed from Google Patents.
US3256173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic furnace with lined cathode pots for the production of aluminum
Assignee: Rio Tinto Switzerland AG
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Filing: 1961-10-24
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Granted: 1966-06-14
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Expires: 1981-10-24
Abstract
No abstract record available.
Inventors
- 👤 Schmitt Johannes
- 👤 Wittner Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:59
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
AN ELECTROLYTIC FURNACE FOR THE PRODUCTION OF ALUMINUM HAVING A CATHODE POT WITH SIDE WALLS LINED WITH A COMPOSITION COMPOSED ESSENTIALLY OF A MIXTURE OF 40 TO 85% BY WEIGHT OF POWDERED SILICON CARBIDE, 45 TO 7% BY WEIGHT OF COKE POWDER AND 15 TO 8% BY WEIGHT OF
Claim 2
Dependent Claim
49 words
AN ELECTROLYTIC FURNACE FOR THE PRODUCTION OF ALUMINUM HAVING A CATHODE POT WITH SIDE WALLS LINED WITH A COMPOSITION COMPOSED ESSENTIALLY OF A MIXTURE OF 40 TO 85% BY WEIGHT OF POWDERED SILICON CARBIDE, 45 TO 7% BY WEIGHT OF COKE POWDER AND 15 TO 8% BY WEIGHT OF
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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |