Enhancements    

Patents of Carl Dirk

Filters, Illuminants, and Customized Spectral Profiles for Reducing Perceptible Changes in Appearance
Issue Date: 10 - 29 - 2013
Application Date: 05 - 14 - 2010
Patent No. 8,570,498

CUSTOMIZABLE SPECTRAL PROFILES FOR FILTERING (Continuation)
Issue Date: 08 - 30 - 2011
Application Date: 12 - 29 - 2009
Patent No. 8,009,278

Illumination Sources and Customizable Spectral Profiles
Issue Date: 04 - 19 - 2011
Application Date: 09 - 21 - 2005
Patent No. 7,929,130

Customizable Spectral Profiles for Filtering
Issue Date: 02 - 16 - 2010
Application Date: 10 - 17 - 2003
Patent No. 7,663,739

Illumination Sources and Customizable Spectral Profiles
Issue Date: 12 - 01 - 2009
Application Date: 09 - 21 - 2005
Patent No. 7,626,693