ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,209, issued on March 31, was assigned to Regents of the University of Minnesota (Minneapolis).

"Pigmented and fluorescent compounds derived from the addition of a primary or secondary amine to an aldehyde" was invented by Clay Jeremy Carter (Minneapolis) and Adrian Hegeman (Minneapolis).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention provides a compound of formula (I): wherein R1, R2, and R3 have any of the values described in the specification, as well as compositions comprising a compound of formula (I), methods for preparing compounds of formula (I), and methods for detecting the presence of an amine in a sample. The compounds are us...