ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,528,040, issued on Jan. 20, was assigned to NGK INSULATORS Ltd. (Nagoya, Japan).
"Honeycomb filter" was invented by Takahiro Oneda (Kariya, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A honeycomb filter includes a honeycomb structure having a porous partition wall and a plurality of plugging portions, wherein a porosity of the plugging portion is 40 to 60%, a central plugging portion having a plugging length of 5 mm or more and an outer peripheral plugging portion having the plugging length of less than 5 mm are disposed, an average plugging length L1(Ave) is 5 mm or more and 10 mm or less, an average plugging length L2(Ave) is 2 mm or more and...