US3787311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for the winning of aluminum
Assignee: BK Giulini Chemie GmbH
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Filing: 1971-12-13
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Granted: 1974-01-22
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Expires: 1991-12-13
Abstract
Abstract In the winning of aluminum by the electrolysis of alumina dissolved in molten electrolyte, wherein the electrolysis current passes through the surface of a carbon cathode, the electrolysis current is equalized over the surface of the carbon cathode.
Inventors
- 👤 H Wittner
- 👤 K Lauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:09
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
38 words
A carbon cathode as claimed in claim 1, further comprising a cathode current withdrawal lead in the array, with the block resistances increasing from the middle of the array outwards in the direction of the current withdrawal lead.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |