US3857762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous analysis for copper concentration
Assignee: Fischer and Porter Co
•
Filing: 1973-12-11
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Granted: 1974-12-31
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Expires: 1993-12-11
Abstract
Abstract An analyzer for directly and continuously measuring the concentration of soluble copper in an aqueous solution by adding potassium thiocyanate thereto in a dilute solution to form cupric thiocyanate. The cupric thiocyanate passes through an electrochemical cell where it is quantitatively reduced to cuprous thiocyanate. The resultant electric current is directly proportional to copper concentration and is measured to provide an indication thereof.
Inventors
- 👤 J Morrow
- 👤 L Dailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:11
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/4045; G01N31/00; G01N31/16; G01N31/166
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A TECHNIQUE FOR CONTINUOUSLY MEASURING THE CONCENTRATION OF CUPRIC COPPER IN AN AQUEOUS SOLUTION COMPRISING THE STEPS OF ADDING POTASSIUM THIOCYANATE TO A SAMPLE OF SAID CUPRIC COPPER SOLUTION IN A DILUTE SOLUTION TO FORM CUPRIC THIOCYANATE, PASSING SAID CUPRIC THIOCYANATE THROUGH AN ELECTROCHEMICAL CELL OPERATING AT A VOLTAGE ACTING TO REDUCE IT TI CUPROUS THIOCYANATE THEREBY INDUCING AN ELECTRIC CURRENT IN THE CELL WHICH IS DIRECTLY PROPORTIONAL TO COPPER CONCENTRATION, AND MEASURING THE CURRENT TO INDICATE THE COPPER CONCENTRATION.
Claim 2
Dependent Claim
80 words
A TECHNIQUE FOR CONTINUOUSLY MEASURING THE CONCENTRATION OF CUPRIC COPPER IN AN AQUEOUS SOLUTION COMPRISING THE STEPS OF ADDING POTASSIUM THIOCYANATE TO A SAMPLE OF SAID CUPRIC COPPER SOLUTION IN A DILUTE SOLUTION TO FORM CUPRIC THIOCYANATE, PASSING SAID CUPRIC THIOCYANATE THROUGH AN ELECTROCHEMICAL CELL OPERATING AT A VOLTAGE ACTING TO REDUCE IT TI CUPROUS THIOCYANATE THEREBY INDUCING AN ELECTRIC CURRENT IN THE CELL WHICH IS DIRECTLY PROPORTIONAL TO COPPER CONCENTRATION, AND MEASURING THE CURRENT TO INDICATE THE COPPER CONCENTRATION.
Claim 3
Dependent Claim
48 words
A technique as set forth in claim 1, wherein said cupric copper is in an aqueous solution having iron present therein, the further step of adding fluoride ion to the sample to form a ferric fluoride complex to prevent the presence of the iron from affecting the measurement.
Claim 4
Dependent Claim
24 words
A technique as set forth in claim 1, further including the step of cooling said sample of cupric copper solution before it is diluted.
Claim 5
Dependent Claim
30 words
A technique as set forth in claim 1, further including the step of adding ammonia bifluoride to said potassium thiocyanate to prevent the presence of iron from affecting the measurement.
Claim 6
Dependent Claim
26 words
A technique as set forth in claim 1 wherein said dilute solution of a sample of said cupric copper is produced by adding dechlorinated water thereto.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |