US3457149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic cell and vacuum process for filling pores in its lining
Assignee: Individual
•
Filing: 1966-11-02
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Granted: 1969-07-22
•
Expires: 1986-11-02
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:03
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
THE PROCESS FOR FILLING THE PORES AND FISSURES OF CARBON CATHODE LININGS OF ELECTROLYTIC CELLS FOR THE REDUCTION OF ALUMINUM WHICH COMPRISES APPLYING VACUUM TO THE AREA BETWEEN THE SHELL AND THE CARBON CATHODE WHILE IT IS BEING HEATED AND BAKED, AND THEREAFTER PROVIDING WITHIN THE CATHODE A MOLTEN HALIDE MATERIAL OF RELATIVELY LOW MELTING POINT WHICH IS SUCKED INTO THE PORES AND FISSURES THEREBY EXCLUDING THE ENTRY OF THE RELATIVELY HIGHER MELTING POINT CRYOLITE FUSION USED DURING SUBSEQUENT ELECTROLYSIS.
Claim 2
Dependent Claim
80 words
THE PROCESS FOR FILLING THE PORES AND FISSURES OF CARBON CATHODE LININGS OF ELECTROLYTIC CELLS FOR THE REDUCTION OF ALUMINUM WHICH COMPRISES APPLYING VACUUM TO THE AREA BETWEEN THE SHELL AND THE CARBON CATHODE WHILE IT IS BEING HEATED AND BAKED, AND THEREAFTER PROVIDING WITHIN THE CATHODE A MOLTEN HALIDE MATERIAL OF RELATIVELY LOW MELTING POINT WHICH IS SUCKED INTO THE PORES AND FISSURES THEREBY EXCLUDING THE ENTRY OF THE RELATIVELY HIGHER MELTING POINT CRYOLITE FUSION USED DURING SUBSEQUENT ELECTROLYSIS.
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) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |