ALEXANDRIA, Va., June 19 -- United States Patent no. 12,330,100, issued on June 17, was assigned to Johns Manville (Denver).
"Highly efficient filter medium" was invented by Jurgen Umminger (Lauda-Konigshofen, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A filter is formed by a multilayer filter medium comprising at least one textile supporting layer, at least one filter layer which is applied to at least one side of the supporting nonwoven, wherein the filter layer is constructed from glass fibres, and at least one textile covering layer which is applied to the filter layer, wherein the filter layer comprises a mixture of at least two types of glass fibres, wherein the first glass fibre type of th...