Headrest speaker device
Patent 4490842 Issued on December 25, 1984. Estimated Expiration Date: 
May 18, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 18, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3303279 Stereophonic head rest Loudspeaker system with heat pipe Speaker system Dental audio and gaseous analgesia applicator Patent #: 4310307 InventorAssigneeApplicationNo. 06/379546 filed on 05/18/1982US Classes:381/86, VEHICLE181/156, Reflex baffle297/391, HEADREST381/349, Bass reflex (e.g., rear wave)381/389, In vehicle5/904WITH SOUND EMITTING MEANSExaminersPrimary: Schreyer, Stafford D.Assistant: Schroeder, L. C. Attorney, Agent or FirmInternational ClassesB60N 2/48 (20060101)H04R 5/02 (20060101) B60R 11/02 (20060101) B60R 11/00 (20060101) Foreign Application Priority Data1981-05-22 JPAbstractHeadrest speaker device, in which the upper ends of pipes supporting a headrest on the upper part of a seat are in communication with speaker cabinets disposed at each side of the headrest and the lower ends of the pipes open toward the outside at the sides of the seat.Other References
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