Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation

Official title: Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper {and including single- and multilayer analytical elements (immunological elements G01N33/54386; involving labelled immunochemicals G01N33/58; for haemoglobin or occult blood G01N33/72)}

G01N33/52 (Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation) appears on 2,555 US grants and 2,448 published applications in this corpus.