US Patent 9549639 Manual blender device and methods

A handheld, hand-operated blender may include a container, a lid threadably connected to an upper portion of the container, a bottom portion including a stationary bottom portion threadably connected to a lower portion of the container and a rotatable bottom portion rotatable with respect to the container. The blender may also include a blade assembly including a plurality of blades and a shaft rotatably connected to the rotatable bottom portion and a gear assembly mechanically connected to the blade assembly and the rotatable bottom portion such that rotation of the rotatable bottom portion rotates the blade assembly at a faster revolution per minute than the rotation of the rotatable bottom portion.