US3392092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activation of cryolite-alumina compositions
Assignee: Individual
•
Filing: 1963-08-30
•
Granted: 1968-07-09
•
Expires: 1983-08-30
Abstract
No abstract record available.
Inventors
- 👤 Isaac M Diller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:54
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE PROCESS OF ACTIVATING MOLTEN CRYOLITE-ALUMINA COMPOSITIONS READY FOR THE ELECTROWINNING OF ALUMINUM SO AS TO INCREASE THE POWER EFFICIENCY AT A GIVEN PRODUCTION RATE BY MEANS OF FIRING HIGH ENERGY SURGES INTO THE MELT OF CRYOLITE-ALUMINA COMPOSITIONS THROUGH A SYSTEM INCLUDING AT LEAST ONE AUXILIARY HIGH TENSION ELECTRODE, WHEREIN THE IMPROVEMENT COMPRISES PREPOLARIZING THE AUXILIARY ELECTRODE BY THE PASSAGE OF ELECTRICAL CURRENT THERETHROUGH BEFORE FIRING HIGH ENERGY SURGES INTO THE MELT.
Claim 2
Dependent Claim
72 words
THE PROCESS OF ACTIVATING MOLTEN CRYOLITE-ALUMINA COMPOSITIONS READY FOR THE ELECTROWINNING OF ALUMINUM SO AS TO INCREASE THE POWER EFFICIENCY AT A GIVEN PRODUCTION RATE BY MEANS OF FIRING HIGH ENERGY SURGES INTO THE MELT OF CRYOLITE-ALUMINA COMPOSITIONS THROUGH A SYSTEM INCLUDING AT LEAST ONE AUXILIARY HIGH TENSION ELECTRODE, WHEREIN THE IMPROVEMENT COMPRISES PREPOLARIZING THE AUXILIARY ELECTRODE BY THE PASSAGE OF ELECTRICAL CURRENT THERETHROUGH BEFORE FIRING HIGH ENERGY SURGES INTO THE MELT.
References Cited (Backward Citations)
US786244A
Cited
US2915442A
Cited
US3028324A
Cited
US3093570A
Cited
US3003885A
Cited
US3244604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |