Patent US2915442A successfully refreshed from Google Patents.
US2915442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of aluminum
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1955-11-28
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Granted: 1959-12-01
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Expires: 1975-11-28
Abstract
No abstract record available.
Inventors
- 👤 Robert A Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:25
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A PROCESS FOR THE ELECTROLYTIC PRODUCTION OF ALUMINUM THE STEPS WHICH COMPRISE DISSOLVING ALUMINA IN A FUSED BATH OF ELECTROLYTE CONSISTING ESSENTIALLY OF FROM 5% TO 95% OF AT LEAST ONE POTASSIUM COMPOUND CHOSEN FROM THE GROUP CONSISTING OF POTASSIUM CRYOLITE POTASIUM CHLORIDE AND POTASSIUM FLURIDE, AND FROM 95% TO 5% OF AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF SODIUM CRYOLITE, SODIUM CHLORIDE, SODIUM FLUORIDE, LITHIUM CRYOLITE, LITHIUM CHLORIDE AND LITHIUM FLURIDE, AND CONTAINING AT LEAST 50% OF CRYOLITE AND PASSING AN ELECTRIC CURRENT THROUGH SAID BATH FROM AN ANODE TO A NEGATIVE CURRENT CONDUCTOR CONSISTING ESSENTIALLY OF AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF THE BORIDES, CARBIDES AND NITRIDES OF TITANIUM, ZIRCONIUM, VANADIUM, TANTALUM, NIOBIUM AND HAFNIUM.
Claim 2
Dependent Claim
125 words
IN A PROCESS FOR THE ELECTROLYTIC PRODUCTION OF ALUMINUM THE STEPS WHICH COMPRISE DISSOLVING ALUMINA IN A FUSED BATH OF ELECTROLYTE CONSISTING ESSENTIALLY OF FROM 5% TO 95% OF AT LEAST ONE POTASSIUM COMPOUND CHOSEN FROM THE GROUP CONSISTING OF POTASSIUM CRYOLITE POTASIUM CHLORIDE AND POTASSIUM FLURIDE, AND FROM 95% TO 5% OF AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF SODIUM CRYOLITE, SODIUM CHLORIDE, SODIUM FLUORIDE, LITHIUM CRYOLITE, LITHIUM CHLORIDE AND LITHIUM FLURIDE, AND CONTAINING AT LEAST 50% OF CRYOLITE AND PASSING AN ELECTRIC CURRENT THROUGH SAID BATH FROM AN ANODE TO A NEGATIVE CURRENT CONDUCTOR CONSISTING ESSENTIALLY OF AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF THE BORIDES, CARBIDES AND NITRIDES OF TITANIUM, ZIRCONIUM, VANADIUM, TANTALUM, NIOBIUM AND HAFNIUM.
References Cited (Backward Citations)
US400664A
Cited
FR1064743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-30 | 1963-06-01 | 1963-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-30 | 1967-06-01 | 1967-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-30 | 1971-06-01 | 1971-12-01 | $7700.00 | Window Closed / Lapsed |