Hearing aid
Patent 4447677 Issued on May 8, 1984. Estimated Expiration Date: 
April 9, 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.
April 9, 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 References3749853 InventorsAssigneeApplicationNo. 06/367214 filed on 04/09/1982US Classes:381/324, Component mounting381/323, Power supply or programming interface terminals381/330Hook over earExaminersPrimary: Pellinen, A. D.Assistant: Schroeder, L. C. Attorney, Agent or FirmInternational ClassesH04R 25/02 (20060101)H04R 25/00 (20060101) Foreign Application Priority Data1981-04-20 JPAbstractA hearing aid has a reproducing transducer and a microphone each having a diaphragm and a sound conduction opening and being closed hermetically except for said sound conduction opening. The reproducing transducer and the microphone are so mounted and accommodated in a housing that the vibration planes of the respective diaphragms are not parallel to each other, and the respective sound conduction openings may be directed towards the outside of the housing. | |
