US4045725A
Expired / Lapsed
US
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Rotating asymmetric electrode for measuring characteristics of electrochemical cells
Assignee: AT&T Inc
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Filing: 1976-03-08
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Granted: 1977-08-30
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Expires: 1996-03-08
Abstract
Abstract In an electrochemical cell passing a constant current, an electrode rotating asymmetrically with respect to a fixed electrode produces an ac voltage, having a component at the rotational frequency, between the rotating and fixed electrodes because the interelectrode distance and dc solution resistance between the electrodes vary. When this electrode is used in an operating two electrode cell, e.g., a plating bath, the ac voltage may be used to map the spatial current distribution. Measurements of solution conductivity may also be made.
Inventors
- 👤 Barry Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:29
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/08; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/07; G01R27/00; G01R27/02; G01R27/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
Apparatus for measuring characteristics of a cell containing an electrolyte and having at least a first electrode comprising: an asymmetrically moving electrode; means for passing a constant current through said cell and through said first electrode; means for moving said asymmetrically moving electrode; means for measuring the voltage between said first electrode and said asymmetrically moving electrode; characterized in that said means for moving periodically varies the distance between said first electrode and said asymmetrically moving electrode thereby periodically varying the resistance and voltage between said first electrode and said asymmetrically moving electrode.
Claim 2
Dependent Claim
93 words
Apparatus for measuring characteristics of a cell containing an electrolyte and having at least a first electrode comprising: an asymmetrically moving electrode; means for passing a constant current through said cell and through said first electrode; means for moving said asymmetrically moving electrode; means for measuring the voltage between said first electrode and said asymmetrically moving electrode; characterized in that said means for moving periodically varies the distance between said first electrode and said asymmetrically moving electrode thereby periodically varying the resistance and voltage between said first electrode and said asymmetrically moving electrode.
Claim 3
Dependent Claim
15 words
Apparatus as recited in claim 1 in which said asymmetrically moving electrode is a disc.
Claim 4
Dependent Claim
16 words
Apparatus as recited in claim 1 in which said asymmetrically moving electrode is a split ring.
Claim 5
Dependent Claim
25 words
Apparatus as recited in claim 1 in which said means for moving rotates said asymmetrically moving electrode in a plane about an axis of rotation.
Claim 6
Dependent Claim
24 words
Apparatus as recited in claim 4 in which said axis of rotation is perpendicular to said plane in which said asymmetrically moving electrode rotates.
Claim 7
Dependent Claim
15 words
Apparatus as recited in claim 5 in which said asymmetrically moving electrode is a disc.
Claim 8
Dependent Claim
16 words
Apparatus as recited in claim 5 in which said asymmetrically moving electrode is a split ring.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |