ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,415,152, issued on Sept. 16, was assigned to VOLVO TRUCK Corp. (Gothenburg, Sweden).
"Tubular air filter element" was invented by Carl Lowstedt (Onsala, Sweden) and Fredrik Rahm (Horby, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "A tube shaped air filter element for a fuel cell vehicle. The air filter element comprises a pair of circumferentially extending ridges on a first inner circumferential envelope surface, each of the pair of ridges protrudes towards a geometric centre axis of the air filter element and is configured to engage with an axially protruding portion of a filter housing."
The patent was filed on Jan. 24, 2023, under Applica...