US3380897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of determining ore concentration
Assignee: Reynolds Metals Co
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Filing: 1964-11-16
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Granted: 1968-04-30
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Expires: 1984-11-16
Abstract
No abstract record available.
Inventors
- 👤 John L Dewey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:33
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A METHOD OF DETERMINING AN UNKNOWN CONCENTRATION OF AN ELECTROCHEMICALLY-ACTIVE MATERIAL IN THE BATH OF AN ELECTROLYTIC REDUCTION CELL COMPRISING THE STEPS OF: ASCERTAINING THE VALUES OF A PLURALITY OF PROJECTED ZEROCURRENT INTERCEPTS FOR A CORRESPONDING NUMBER OF VOLTAGE-CURRENT CURVES FOR OPERATION OF THE CELL AT DIFFERENT BATH CONCENTRATIONS, AND RECORDING THE VARIOUS PROJECTED ZERO-CURRENT INTERCEPT VALUES CORRESPONDING TO EACH OF THE DIFFERENT BATH CONCENTRATIONSN; ASCERTAINING THE PROJECTED ZERO-CURRENT INTERCEPT VALUE CORRESPONDING TO THE UNKNOWN BATH CONCENTRATION THAT IS TO BE DETERMINED; COMPARING THE PROJECTED ZERO-CURRENT INTERCEPT VALUE CORRESPONDING TO SAID UNKNOWN BATH CONCENTRATION WITH A FUNCTION OF SAID RECORDED ZERO-CURRENT INTERCEPT VALUES; AND
Claim 2
Independent Claim
104 words
A METHOD OF DETERMINING AN UNKNOWN CONCENTRATION OF AN ELECTROCHEMICALLY-ACTIVE MATERIAL IN THE BATH OF AN ELECTROLYTIC REDUCTION CELL COMPRISING THE STEPS OF: ASCERTAINING THE VALUES OF A PLURALITY OF PROJECTED ZEROCURRENT INTERCEPTS FOR A CORRESPONDING NUMBER OF VOLTAGE-CURRENT CURVES FOR OPERATION OF THE CELL AT DIFFERENT BATH CONCENTRATIONS, AND RECORDING THE VARIOUS PROJECTED ZERO-CURRENT INTERCEPT VALUES CORRESPONDING TO EACH OF THE DIFFERENT BATH CONCENTRATIONSN; ASCERTAINING THE PROJECTED ZERO-CURRENT INTERCEPT VALUE CORRESPONDING TO THE UNKNOWN BATH CONCENTRATION THAT IS TO BE DETERMINED; COMPARING THE PROJECTED ZERO-CURRENT INTERCEPT VALUE CORRESPONDING TO SAID UNKNOWN BATH CONCENTRATION WITH A FUNCTION OF SAID RECORDED ZERO-CURRENT INTERCEPT VALUES; AND
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |