US Patent Issued to JOHNSON SCREENS on May 12 for "Biofilter with shaped underdrain assembly" (French, American Inventors)

ALEXANDRIA, Va., May 12 -- United States Patent no. 12,623,939, issued on May 12, was assigned to JOHNSON SCREENS INC. (New Brighton, Minn.).

"Biofilter with shaped underdrain assembly" was invented by Michael R. Ekholm (Minneapolis), Elsa Vulliez (Chatellerault, France), Clement Vitteau (Availles en Chatellerault, France) and Fabrice Coura-Geot (Availles en Chatellerault, France).

According to the abstract* released by the U.S. Patent & Trademark Office: "An improved biofilter design and related methods of utilizing shaped drain assemblies for directing fluid flow though a biofilter media to promote biological interaction. A shaped drain assembly can include a plurality of elongated drain structures having a permeable upper surface, a. l...