ALEXANDRIA, Va., July 3 -- United States Patent no. 12,344,704, issued on July 1, was assigned to Phillips 66 Co. (Houston).

"Repeat units for photovoltaic applications" was invented by Hualong Pan (Bartlesville, Okla.), Reed Eisenhart (Bartlesville, Okla.), Brian Worfolk (Tulsa, Okla.) and Laura Nielsen (Bartlesville, Okla.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A repeat unit comprisingIn the repeat unit, X1 and X2 are independently selected from the group consisting of: F, Cl, H, and combinations thereof. Additionally, in this monomer, R' and R" are independently selected from an alkyl group, an aryl group, or combinations thereof. Also, R3, and R4 are independently selected from unsubstituted or s...