Optical filters for forming enhanced images
US Patent # 5,646,781 Granted July 8, 1997 Inventor: Robert L. Johnson, Jr.
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Protective optical filter assembly
US Patent # 6,918,673 Granted July 19, 2005 Inventors: Robert L. Johnson, Natalia Gorawski, Barry O'Dwyer
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January 28, 2020
System for multispectral imaging of fluorescence
US Patent # 9,155,474 Inventors: Gary E. Carver, Sheetal K. Chanda, William A. Morrison, Sarah A. Locknar, Robert L. Johnson, Jr.
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Blocking in an Optical Filter
To understand blocking, one has to understand the concept of optical density (OD). In an interference filter, OD is generated by reflecting unwanted light back instead of letting it go through the filter.
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January 16, 2020