Modeling properties of flake finishes using directional resolution and statistical flake orientation distribution function
US4529308A
Spectrophotometer apparatus and method including scale drift correction feature
US4093991A
Spectrophotometer-digital data processing system for appearance measurements providing fast and accurate standardization, ease of use for different appearance measurements and fast response
US4003660A
Sensing head assembly for multi-color printing press on-line densitometer
US3707030A
Method of making fiber light-pipe diffuser for colorimeters
US3549264A
Instrument for measuring the geometric attributes of metallic appearance by measuring light reflected at various angles from a surface
US3526777A
Reflectance measuring apparatus including a mask for compensating for movement of the specimen