Instrument for on-line measurement of the absolute electrical conductivity of a liquid
Patent 4751466 Issued on June 14, 1988. Estimated Expiration Date: 
January 20, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 20, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2599413 2871445 3376501 3582767 3924175 Measuring cells for measuring electrical conductivity of liquids Four electrode conductivity sensor Patent #: 4118663 InventorsAssigneeApplicationNo. 07/005184 filed on 01/20/1987US Classes:324/449, With axially arranged electrodes324/444Which includes current and voltage electrodesExaminersPrimary: Eisenzopf, Reinhard J.Assistant: Miele, Anthony L. Attorney, Agent or FirmInternational ClassesG01N 27/07 (20060101)G01N 27/06 (20060101) G01N 33/32 (20060101) G01N 33/26 (20060101) AbstractThe invention is directed to an instrument for measuring the absolute electrical conductivity of liquids, which instrument may be employed on-line in a recirculating paint bath to measure the conductivity of the paint. The instrument comprises a four electrode probe and a meter which comprises a device for generating and controlling an AC current connected to the first electrode such that a constant AC voltage is maintained across the second and fourth electrodes and a device for measuring and detecting an AC current connected to the third electrode, wherein the fourth electrode is maintained at the same potential as a nearby ground. | |
