Patent No. EP4042888 (titled "Non-Combustion Heating Type Flavor Inhaler") was filed by Japan Tobacco on Oct 10, 2019. The application was issued on Feb 19, 2025.
A non-combustion heating type flavor inhaler comprising a tobacco rod, a cooling segment, and a mouthpiece with a filter and a center hole filter in sequence, wherein the center hole filter has a hole diameter of 20-40% of its diameter and a hardness of 90% or more.

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