Electric hearing aid
Patent 4629833 Issued on December 16, 1986. Estimated Expiration Date: 
December 16, 2003. 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.
December 16, 2003. 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 Re27487 3772478 3798390 3909556 Hearing aid receiver with plural transducers Behind-the-ear type hearing aid Patent #: 4456795 InventorsAssigneeApplicationNo. 06/507339 filed on 06/24/1983US Classes:381/320, Spectral control381/338, With tubular waveguide or resonant element381/98INCLUDING FREQUENCY CONTROLExaminersPrimary: Rubinson, Gene Z.Assistant: Byrd, Danita R. Attorney, Agent or FirmInternational ClassesH04R 25/02 (20060101)H04R 25/00 (20060101) H04R 1/22 (20060101) Foreign Application Priority Data1982-07-01 DEAbstractAn exemplary embodiment comprises an acoustic signal pickup, amplification and reproduction sections wherein the latter contains a plurality of sound sources which influence a shared sound transmission arrangement collecting the sound, influencing it upon formation of a specific transfer characteristic. Given such hearing aids, the originally set frequency characteristic should also be maintained given the maximally attainable output level. To this end, the disclosure provides two identical sound sources, proceeding from which the generated sound is supplied to the ear with specific adaptation to a particular individual hearing loss. For example, the desired transfer characteristic is achieved by establishing selected differential transmission properties for the respective acoustic channels leading from the respective sound sources to the shared passage leading to the ear. An inventively improved hearing aid is particularly suitable for employment as a hearing prothesis for hearing-impaired persons.Other References
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