ALEXANDRIA, Va., June 16 -- United States Patent no. 12,654,116, issued on June 16.
"Composite filter body" was invented by Guangli Wang (Handan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A composite filter body, comprising: a front filter layer, the front filter layer being a structure made of bamboo fiber material, and the front filter layer being used for pre-filtering air; and a main filter layer is stacked with the front filter layer, the main filter layer is communicated with the front filter layer, the main filter layer is one or a combination of a glass fiber layer, a polyester fiber layer, an activated carbon layer, a melt-blown non-woven fabric layer, and an antibacterial coating."
The ...