US Patent 11064745 Face mask with separate inhaling and exhaling portions

A face mask with separate inhaling and exhaling portions can include an upper mask portion and a lower mask portion. A plurality of folds extend across each of the upper and lower mask portions. The lower mask portion can be larger than the upper mask portion. A lower edge of the upper mask portion can be secured to an upper edge of the lower portion. In use, the upper mask portion can cover the nose and the lower mask portion can cover the mouth. A user can inhale through the upper portion and exhale through the lower portion. In this manner, CO2 exhaled by the user will not mix with air that is inhaled.