Process colorimeter
Patent 4449821 Issued on May 22, 1984. Estimated Expiration Date: 
July 14, 2002. 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.
July 14, 2002. 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 3245305 3431054 3506358 3646331 3806258 3874799 Colorimetric fluid analyzer Spectrophotometer-digital data processing system for appearance measurements providing fast and accurate standardization, ease of use for different appearance measurements and fast response Automatic computing color meter Method and apparatus for optically analyzing specimen by using two light beams InventorAssigneeApplicationNo. 06/398385 filed on 07/14/1982US Classes:356/319, Utilizing a spectrophotometer (i.e., plural beam)250/205Controlling light source intensityExaminersPrimary: Evans, F. L.International ClassesG01J 1/30 (20060101)G01J 3/50 (20060101) G01J 3/10 (20060101) G01J 3/00 (20060101) G01J 1/10 (20060101) AbstractA colorimeter for measuring color of an object, in particular for measuring the color of liquids such as paints in a process stream. In the colorimeter, a single analytical light beam, with its blue and red intensity ratio controlled through a feedback loop, is directed to a sample whose color is being measured. A portion of the analytical light beam is reflected from the sample into a grating monochromator which disperses the light beam into its spectra. A detector array is attached to the monochromator which converts the spectra of the light beam into discrete signals which are then multiplexed with instrument status and reference color signals into an A/D converter. The output of the A/D converter is then fed directly to a computer programmed to directly provide standard color values.Other References
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