US4149950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flow-through ionic test cell
Assignee: Bayer Corp
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Filing: 1978-08-07
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Granted: 1979-04-17
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Expires: 1998-08-07
Abstract
Abstract A flow-through test cell is disclosed which features an electrical conductor disposed in non-contacting adjacency with an ionic sensing electrode and a porous liquid junction for improving signal-to-noise ratio. The electrical conductor provides a low-impedance path through the fluid which effectively neutralizes signal distortion due to impedance variations in the air-segmented, continuously flowing stream. The electrical conductor includes distended sections which fixedly position such conductor in the ionic test cell, whereby shorting contact with said ionic sensing electrode and said porous liquid junction element is prevented.
Inventors
- 👤 John R. Potts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:19
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
95 words
A flow-through test cell for testing an ionic activity of a solution including a conduit for conveying said solution in a stream segmented by inert fluid segments, and a pair of spaced electrodes in association with said conduit for measuring the ionic activity of one or more segments of said solution being conveyed therebetween, an improvement comprising an electrical conductor disposed within said conduit and extending, at least, between said spaced electrodes for improving the signal-to-noise ratio; and means for fixedly positioning said electrical conductor within said solution stream in non-contacting adjacency with said electrodes.
Claim 2
Dependent Claim
95 words
A flow-through test cell for testing an ionic activity of a solution including a conduit for conveying said solution in a stream segmented by inert fluid segments, and a pair of spaced electrodes in association with said conduit for measuring the ionic activity of one or more segments of said solution being conveyed therebetween, an improvement comprising an electrical conductor disposed within said conduit and extending, at least, between said spaced electrodes for improving the signal-to-noise ratio; and means for fixedly positioning said electrical conductor within said solution stream in non-contacting adjacency with said electrodes.
Claim 3
Dependent Claim
47 words
The flow-through test cell of claim 1, wherein said electrical conductor is a wire having a substantially straight section extending at least between said electrodes and said positioning means comprises end portions of said electrical conductor for fixedly positioning said straight wire section centrally within said conduit.
Claim 4
Dependent Claim
13 words
The flow-through test cell of claim 2, wherein said end portions are coil-shaped.
Claim 5
Dependent Claim
38 words
The flow-through test cell of claim 2, wherein said conduit is comprised of a glass wall, and said positioning means includes means for anchoring at least one of said end portions into said glass wall of said conduit.
Claim 6
Dependent Claim
16 words
The flow-through test cell of claim 1, wherein said electrical conductor extends beyond said spaced electrodes.
Claim 7
Dependent Claim
19 words
The flow-through test cell of claim 1, wherein said cell comprises means for measuring the pH of said solution.
Claim 8
Dependent Claim
29 words
The flow-through test cell of claim 1, wherein said positioning means includes means for anchoring at least one end-portion of said electrical conductor into a wall of said conduit.
Claim 9
Dependent Claim
16 words
The flow-through test cell of claim 1, wherein said electrical conductor is comprised of stainless steel.
Claim 10
Dependent Claim
15 words
The flow-through test cell of claim 1, wherein said electrical conductor is comprised of platinum.
Claim 11
Dependent Claim
18 words
The flow-through test cell of claim 1, wherein said electrical conductor is comprised of a chemically inert material.
Claim 12
Dependent Claim
114 words
A flow-through ionic cell, comprising: a conduit for conducting a solution as a stream separated by inert fluid segments; a first electrode means comprising an ionic sensing electrode associated with said conduit; a second electrode means comprising a liquid junction in fluid communication with said conduit and spaced-apart from said sensing electrode; an electrical conductor disposed along said conduit and extended at least between said sensing electrode and said liquid junction for providing a low-impedance path to improve signal-to-noise ratio, said electrical conductor having a substantially straight portion in non-contacting relationship to said sensing electrode and said liquid junction, said electrical conductor having an end portion fixedly positioning said straight portion within said conduit.
Claim 13
Dependent Claim
114 words
A flow-through ionic cell, comprising: a conduit for conducting a solution as a stream separated by inert fluid segments; a first electrode means comprising an ionic sensing electrode associated with said conduit; a second electrode means comprising a liquid junction in fluid communication with said conduit and spaced-apart from said sensing electrode; an electrical conductor disposed along said conduit and extended at least between said sensing electrode and said liquid junction for providing a low-impedance path to improve signal-to-noise ratio, said electrical conductor having a substantially straight portion in non-contacting relationship to said sensing electrode and said liquid junction, said electrical conductor having an end portion fixedly positioning said straight portion within said conduit.
Claim 14
Dependent Claim
27 words
The flow-through ionic cell in accordance with claim 11, wherein said ionic sensing electrode has a length which is longer than any of said inert fluid segments.
Claim 15
Dependent Claim
15 words
The flow-through ionic cell in accordance with claim 11, wherein said end portion is coil-shaped.
Claim 16
Dependent Claim
25 words
The flow-through ionic cell in accordance with claim 11, wherein said electrical conductor has a second end portion cooperating to fixedly position said electrical conductor.
Claim 17
Dependent Claim
20 words
The flow-through ionic cell in accordance with claim 14, wherein each of said first and second end portions are coil-shaped.
Claim 18
Dependent Claim
19 words
The flow-through ionic cell in accordance with claim 11, wherein said electrical conductor comprises a substantially chemically inert material.
Claim 19
Dependent Claim
16 words
The flow-through ionic cell in accordance with claim 16, wherein said chemically inert material comprises platinum.
Claim 20
Dependent Claim
17 words
The flow-through ionic cell in accordance with claim 16, wherein said chemically inert material comprises stainless steel.
Claim 21
Dependent Claim
17 words
The flow-through ionic cell in accordance with claim 11, wherein said sensing electrode is a pH membrane.
Claim 22
Dependent Claim
27 words
The flow-through ionic cell in accordance with claim 19, wherein said pH membrane is disposed within a mid-portion of said conduit and has an annular bulb-like shape.
Claim 23
Dependent Claim
25 words
The flow-through ionic cell in accordance with claim 11, wherein said liquid junction comprises a frit disposed flush with an inner wall of said conduit.
References Cited (Backward Citations)
US3649504A
Cited
US3732159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |