Patent US4719441A successfully refreshed from Google Patents.
US4719441A
Expired / Lapsed
US
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Sensor for measuring electrical conductivity
Assignee: NAVASINA AG
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Filing: 1986-02-14
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Granted: 1988-01-12
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Expires: 2006-02-14
Abstract
Abstract At least two electrodes (1, 2) each provided with at least one lead (5) are applied in the form of conductor tracks to a substrate. The leads (5) can be made of a material having a lower standard potential than that of the electrodes (1, 2). A dielectric (6) covers the electrode ends and, up to the contact points (4), the leads (5). As required, the electrodes (1, 2) can be designed and used as a heating electrode and/or as a temperature sensor. Moreover, the electrodes can be arranged on one side or on both sides of the substrate board (7).
Inventors
- 👤 Petr Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:18
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/07; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
A sensor for measuring electrical conductivity, comprising: an electrically-insulating substrate, the substrate being one of heat and corrosion resistant at least two, spaced electrodes exposed on the substrate, the electrodes being one of heat and corrosion resistant; at least two electrically-conductive leads on the substrate, one end of each lead overlapping a portion of a respective one of the electrode; and a dielectric covering the leads, the dielectric being one of heat and corrosion resistant whereby to define a measuring area of the exposed electrodes on one side of the one, dielectric-covered, lead-overlapped ends of the electrodes, except for a contact-point portion of each lead at the other end thereof, remote from the one end overlapping the electrode, whereby to define a contact point thereat.
Claim 2
Dependent Claim
125 words
A sensor for measuring electrical conductivity, comprising: an electrically-insulating substrate, the substrate being one of heat and corrosion resistant at least two, spaced electrodes exposed on the substrate, the electrodes being one of heat and corrosion resistant; at least two electrically-conductive leads on the substrate, one end of each lead overlapping a portion of a respective one of the electrode; and a dielectric covering the leads, the dielectric being one of heat and corrosion resistant whereby to define a measuring area of the exposed electrodes on one side of the one, dielectric-covered, lead-overlapped ends of the electrodes, except for a contact-point portion of each lead at the other end thereof, remote from the one end overlapping the electrode, whereby to define a contact point thereat.
Claim 3
Dependent Claim
32 words
A sensor as claimed in claim 1, wherein the electrodes and the leads are made of different materials, the electrode material having a higher standard potential than the material of the leads.
Claim 4
Dependent Claim
13 words
A sensor as claimed in claim 1, wherein the electrodes consist of platinum.
Claim 5
Dependent Claim
21 words
A sensor as claimed in claim 1, wherein the substrate is made of alumina to the extent of more than 95%.
Claim 6
Dependent Claim
13 words
A sensor as claimed in claim 3, wherein the leads consist of silver/palladium.
Claim 7
Dependent Claim
14 words
A sensor as claimed in claim 5, wherein the leads have tin-plated contact points.
Claim 8
Dependent Claim
24 words
A sensor as claimed in claim 1, wherein one electrode is arranged on the other side of the substrate relative to the remaining electrodes.
Claim 9
Dependent Claim
30 words
A sensor as claimed in claim 1, wherein one of the two electrodes has at least two leads for use as one of a heating electrode and a temperature sensor.
Claim 10
Dependent Claim
33 words
A sensor as claimed in claim 1, wherein one electrode has two leads for use as a heating element, and another electrode has at least two leads for use as a temperature sensor.
Claim 11
Dependent Claim
71 words
A process for the production of the sensor as claimed in claim 2, which comprises, a first operation of applying electrodes to a substrate, a second operation of applying leads to the substrate and firing them at a temperature below the melting point of the electrodes, and finally, a third operation of applying a dielectric to the substrate and firing it at a temperature below the melting point of the leads.
Claim 12
Independent Claim
197 words
A method of measuring electrical conductivity, comprising: providing an electrically-insulating substrate, the substrate being one of heat and corrosion resistant; providing at least two, spaced electrodes exposed on the substrate, the electrodes being one of heat and corrosion resistant; providing at least three electrically-conductive leads on the substrate, one end of one lead overlapping a portion of one of the electrodes and one end of the other two leads overlapping spaced portions of the other electrode; providing a dielectric covering the leads, the dielectric being one of heat and corrosion resistant, whereby to define a measuring area of the exposed electrodes on one side of the one, dielectri-covered, lead-overlapped ends of the electrodes, except for a contact-point portion of each lead at the other end thereof, remote from the one end overlapping the electrode, whereby to define a contact point thereat; applying an electric potential across the contact point portions of the other two leads to heat the electrode overlapped thereby conductively sufficiently to clean off a deposit on the substrate between the electrodes; and sensing the electrical conductivity of the deposit at the contact point portion of the one electrode while so applying the electric potential.
Claim 13
Independent Claim
197 words
A method of measuring electrical conductivity, comprising: providing an electrically-insulating substrate, the substrate being one of heat and corrosion resistant; providing at least two, spaced electrodes exposed on the substrate, the electrodes being one of heat and corrosion resistant; providing at least three electrically-conductive leads on the substrate, one end of one lead overlapping a portion of one of the electrodes and one end of the other two leads overlapping spaced portions of the other electrode; providing a dielectric covering the leads, the dielectric being one of heat and corrosion resistant, whereby to define a measuring area of the exposed electrodes on one side of the one, dielectri-covered, lead-overlapped ends of the electrodes, except for a contact-point portion of each lead at the other end thereof, remote from the one end overlapping the electrode, whereby to define a contact point thereat; applying an electric potential across the contact point portions of the other two leads to heat the electrode overlapped thereby conductively sufficiently to clean off a deposit on the substrate between the electrodes; and sensing the electrical conductivity of the deposit at the contact point portion of the one electrode while so applying the electric potential.
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) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |