US3329592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for controlling aluminum reduction pots
Assignee: Reynolds Metals Co
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Filing: 1963-08-30
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Granted: 1967-07-04
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Expires: 1983-08-30
Abstract
No abstract record available.
Inventors
- 👤 Eugene C Uhrenholdt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:28
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
THE METHOD OF CONTROLLING THE WORKING VOLTAGE OF A PLURALITY OF ALUMINUM REDUCTION POTS, EACH POT HAVING A RELATIVELY MOVABLE AND SPACED ANODE AND CATHODE, AND A DETERMINED OPTIMUM WORKING VOLTAGE VARIABLE IN RESPONSE TO VARIATIONS IN SPACING BETWEEN SAID ANODE AND CATHODE AND CHANGES IN ALUMINA CONCENTRATION IN SAID POT DURING ELECTROLYSIS COMPRISING THE STEPS OF: PRODUCING A REFERENCE SIGNAL PROPORTIONAL TO SAID DETERMINED OPTIMUM WORKING VOLTAGE OF EACH OF SAID POTS; CALIBRATING EACH OF SAID REFERENCE SIGNALS WITH A SINGLE STANDARD SIGNAL; SEQUENTIALLY AND PERIODICALLY COMPARING EACH OF SAID REFERENCE SIGNALS WITH SAID SINGLE STANDARD SIGNAL; AND ADJUSTING SAID ANODE RELATIVE TO SAID CATHODE IN EACH OF SAID RESPECTIVE POTS IN RESPONSE TO VARIATIONS BETWEEN SAID REFERENCE SIGNALS AND SAID STANDARD SIGNAL TO BALANCE EACH OF SAID REFERENCE SIGNALS WITH SAID STANDARD SIGNAL, THEREBY CONTROLLING THE WORKING VOLTAGE OF EACH OF SAID REDUCTION POTS.
Claim 2
Independent Claim
146 words
THE METHOD OF CONTROLLING THE WORKING VOLTAGE OF A PLURALITY OF ALUMINUM REDUCTION POTS, EACH POT HAVING A RELATIVELY MOVABLE AND SPACED ANODE AND CATHODE, AND A DETERMINED OPTIMUM WORKING VOLTAGE VARIABLE IN RESPONSE TO VARIATIONS IN SPACING BETWEEN SAID ANODE AND CATHODE AND CHANGES IN ALUMINA CONCENTRATION IN SAID POT DURING ELECTROLYSIS COMPRISING THE STEPS OF: PRODUCING A REFERENCE SIGNAL PROPORTIONAL TO SAID DETERMINED OPTIMUM WORKING VOLTAGE OF EACH OF SAID POTS; CALIBRATING EACH OF SAID REFERENCE SIGNALS WITH A SINGLE STANDARD SIGNAL; SEQUENTIALLY AND PERIODICALLY COMPARING EACH OF SAID REFERENCE SIGNALS WITH SAID SINGLE STANDARD SIGNAL; AND ADJUSTING SAID ANODE RELATIVE TO SAID CATHODE IN EACH OF SAID RESPECTIVE POTS IN RESPONSE TO VARIATIONS BETWEEN SAID REFERENCE SIGNALS AND SAID STANDARD SIGNAL TO BALANCE EACH OF SAID REFERENCE SIGNALS WITH SAID STANDARD SIGNAL, THEREBY CONTROLLING THE WORKING VOLTAGE OF EACH OF SAID REDUCTION POTS.
Claim 3
Dependent Claim
98 words
IN COMBINATION WITH A PLURALITY OF ALUMINUM REDUCTION POTS FOR THE ELECTROLYTIC REDUCTION OF ALUMINA, EACH HAVING A SPACED RELATIVELY MOVABLE ANODE AND CATHODE BETWEEN WHICH AN ELECTROLYZING CURRENT IS PASSED AND A RESULTING POT WORKING VOLTAGE IS DEVELOPED, MEANS FOR CONTROLLING SAID WORKING VOLTAGE COMPRISING: CIRCUIT MEANS INCLUDING A VARIABLE RESISTANCE IN SHUNT ACROSS SAID ANODE AND CATHODE OF EACH POT TO PRODUCE A VARIABLE REFERENCE SIGNAL PROPORTIONAL TO SAID WORKING VOLTAGE; MEANS PROVIDING A SINGLE STANDARD SIGNAL FOR ALL THE POTS; AND MEANS FOR PERIODICALLY COMPARING AND BALANCING EACH SAID REFERENCE SIGNAL WITH SAID STANDARD SIGNAL.
Claim 4
Dependent Claim
98 words
IN COMBINATION WITH A PLURALITY OF ALUMINUM REDUCTION POTS FOR THE ELECTROLYTIC REDUCTION OF ALUMINA, EACH HAVING A SPACED RELATIVELY MOVABLE ANODE AND CATHODE BETWEEN WHICH AN ELECTROLYZING CURRENT IS PASSED AND A RESULTING POT WORKING VOLTAGE IS DEVELOPED, MEANS FOR CONTROLLING SAID WORKING VOLTAGE COMPRISING: CIRCUIT MEANS INCLUDING A VARIABLE RESISTANCE IN SHUNT ACROSS SAID ANODE AND CATHODE OF EACH POT TO PRODUCE A VARIABLE REFERENCE SIGNAL PROPORTIONAL TO SAID WORKING VOLTAGE; MEANS PROVIDING A SINGLE STANDARD SIGNAL FOR ALL THE POTS; AND MEANS FOR PERIODICALLY COMPARING AND BALANCING EACH SAID REFERENCE SIGNAL WITH SAID STANDARD SIGNAL.
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) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |