ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,481,242, issued on Nov. 25, was assigned to Canon K.K. (Tokyo).
"Duct unit and image forming apparatus" was invented by Chiharu Kageyama (Ibaraki, Japan), Masaki Kakitani (Chiba, Japan) and Rin Ishikawa (Ibaraki, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A first sound absorbing member is disposed outside a fan connecting duct connected to an image-formation exhaust fan. The first sound absorbing member includes a first-layer perforated plate having a plurality of sound absorbing holes and a second-layer sound absorbing sheet covering the plurality of sound absorbing holes. The first sound absorbing member provides the effect of reducing airfl...