ALEXANDRIA, Va., April 7 -- United States Patent no. 12,598,408, issued on April 7, was assigned to ALPS ALPINE Co. LTD. (Tokyo).
"Acoustic apparatus" was invented by Ryo Ito (Fukushima, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An acoustic apparatus includes at least two speakers, each of the speakers having a sound producing direction directed to a corresponding ear of left and right ears of a listener; and an enclosure covering a back portion of a corresponding speaker of the speakers. An opening to open the enclosure is provided at a position further away from the corresponding ear than the corresponding speaker of the speakers. An opening area of the opening is greater than or equal to an eff...