US Patent 9402460 Hair brush

Hair brushes are disclosed that include a brush head having opposing front and back sides with a hollow portion therebetween. The back side includes a plurality of longitudinal apertures that extend between first and second ends of the brush head, at least one of the longitudinal apertures having a length L. The front side includes first and second sets of apertures separated by a medial portion. At least one of the apertures of the first and second sets of apertures has a length dimension of at least about 0.3 L to about 0.6 L.