U.S. federal trademark · Serial No. 72375544 · Reg. No. 0941439
PHOTOMETERS, NEPHELOMETERS, [ REFRACTOMETERS, RECORDERS, RATIO RECORDERS, DIFFERENTIAL TURBIDIMETERS, COLORIMETERS, MONOCHROMATIC LIGHT SOURCES PRODUCING LIGHT OF A SINGLE WAVE LENGTH, ] DUST DETECTORS FOR INDICATING MASS CONCENTRATION OF PARTICULATE MATTER IN THE ATMOSPHERE, COLOR STANDARDS FOR GRADING HONEY, MAPLE SYRUP, AND OTHER LIQUIDS BY COLOR COMPARISON, [ COLORIMETRIC ABSORPTION CELLS FOR USE IN MONITORING COLOR CONCENTRATIONS IN EFFLUENTS, THERMOMETERS, ] AND LIGHT SCATTERING CELLS FOR USE IN DETERMINING PHYSICAL PROPERTIES SUCH AS MOLECULAR WEIGHTS
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