US Patent 11647822 Diffuser and hair dryer having a diffuser

A diffuser for a hair dryer includes a diffusing case having a rear side removably coupled to a main body of the hair dryer. Air or fluid discharged from the main body is introduced into the diffusing case through an inlet hole defined at the rear side. A n open surface is defined at a front side of the diffusing case such that the air introduced into the diffusing case is discharged to an outside through the open surface. The diffusing case includes a front circumferential portion surrounding the open surface. The front circumferential portion includes a first portion and a second portion. The first portion is at least partially located further forward of the second portion.