US3449233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoride analyzer
Assignee: Fischer and Porter Co
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Filing: 1966-11-10
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Granted: 1969-06-10
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Expires: 1986-11-10
Abstract
No abstract record available.
Inventors
- 👤 James J Morrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:49
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/4045
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A FLUORIDE ANALYZER FOR MEASURING THE FLUORIDE LEVEL IN A FLUORIDATED WATER SUPPLY, SAID ANALYZER COMPRISING: (A) AN AMPEROMETRIC CELL CONSTITUTED BY AN ANODE DISPOSED CONCENTRICALLY WITHIN A TUBULAR CATHODE TO DEFINE AN ANNULAR SPACE THEREBETWEEN, S AID ANODE BEING FORMED OF ALUMINUM OF HIGH PURITY, SAID CATHODE BEING FORMED OF A MATERIAL RESULTING IN A SPONTANEOUSLY ACTING CELL, (B) MEANS TO ROTATE SAID ANODE AT A CONSTANT RELATIVELY HIGH RATE, (C) CIRCUIT MEANS COUPLED BETWEEN SAID ANODE AND CATHODE TO DERIVE A SIGNAL THEREFROM AS A FUNCTION OF CURRENT FLOW IN SAID CELL, AND (D) WATER TREATMENT MEANS TO REMOVE INTERFERENTS FROM A SAMPLE STREAM OF WATER TO BE ANALYZED AND TO CONDUCT IT INTO SAID ANNULAR SPACE IN SAID CELL AT A PREDETERMINED FLOW RATE WHEREBY SAID ALUMINUM ANODE IS POLARIZED IN THE ABSENCE OF FLUORIDE TO PRODUCE SUBSTANTIALLY NO CURRENT FLOW IN SAID CELL AND IS DEPOLARIZED IN THE PRESENCE OF FLORIDE TO PRODUCE A CURRENT FLOW THEREIN WHICH DEPENDS ON THE CONCENTRATION OF FLUORIDE.
Claim 2
Dependent Claim
168 words
A FLUORIDE ANALYZER FOR MEASURING THE FLUORIDE LEVEL IN A FLUORIDATED WATER SUPPLY, SAID ANALYZER COMPRISING: (A) AN AMPEROMETRIC CELL CONSTITUTED BY AN ANODE DISPOSED CONCENTRICALLY WITHIN A TUBULAR CATHODE TO DEFINE AN ANNULAR SPACE THEREBETWEEN, S AID ANODE BEING FORMED OF ALUMINUM OF HIGH PURITY, SAID CATHODE BEING FORMED OF A MATERIAL RESULTING IN A SPONTANEOUSLY ACTING CELL, (B) MEANS TO ROTATE SAID ANODE AT A CONSTANT RELATIVELY HIGH RATE, (C) CIRCUIT MEANS COUPLED BETWEEN SAID ANODE AND CATHODE TO DERIVE A SIGNAL THEREFROM AS A FUNCTION OF CURRENT FLOW IN SAID CELL, AND (D) WATER TREATMENT MEANS TO REMOVE INTERFERENTS FROM A SAMPLE STREAM OF WATER TO BE ANALYZED AND TO CONDUCT IT INTO SAID ANNULAR SPACE IN SAID CELL AT A PREDETERMINED FLOW RATE WHEREBY SAID ALUMINUM ANODE IS POLARIZED IN THE ABSENCE OF FLUORIDE TO PRODUCE SUBSTANTIALLY NO CURRENT FLOW IN SAID CELL AND IS DEPOLARIZED IN THE PRESENCE OF FLORIDE TO PRODUCE A CURRENT FLOW THEREIN WHICH DEPENDS ON THE CONCENTRATION OF FLUORIDE.
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) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |