ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,532,910, issued on Jan. 27.
"Cartridge cigarette filter" was invented by William R. Skelly (Toronto).
According to the abstract* released by the U.S. Patent & Trademark Office: "A cartridge cigarette filter includes a cylindrical sleeve, a tipping paper layer, a fiber filter body, and at least one hermetic locking feature. The cylindrical sleeve configured with a mouth end, a cigarette end, an outer surface, and an inner surface. The mouth end is adjacently and concentrically connected to the cigarette end. The outer surface is externally extended from the mouth end to the cigarette end, and the inner surface is internally extended from the mouth end to the cigarette end. The tipping...