ALEXANDRIA, Virginia, Sept. 26 -- ECOLAB USA INC., St. Paul, Minnesota has been assigned a patent (No. US 11767393 B2, initially filed Oct. 21, 2021) developed by Ashish Dhawan, Aurora, Illinois, and Carter M. Silvernail, Lakeville, Minnesota, for "(Hydroxyalkyl)aminophenol polymers and methods of use." . . .