ALEXANDRIA, Va., March 19 -- United States Patent no. 12,256,638, issued on March 18, was assigned to Sumitomo Chemical Co. Ltd. (Tokyo).
"Photoactive compound" was invented by Kiran Kamtekar (Godmanchester, Great Britain).
According to the abstract* released by the U.S. Patent & Trademark Office: "A compound of formula (I): EAG-EDG-EAG (I) wherein EDG is an electron-donating group comprising a polycyclic heteroaromatic group and each EAG is an electron-accepting group of formula (II): (II) wherein R10 in each occurrence is H or a substituent; --- is a bond to EDG; and each X1-X4 is independently CR11 or N wherein R11 in each occurrence is H or a substituent, with the proviso that at least one occurrence of at least one of X1-X4 is N. The...