Tinnitus masker
Patent 4222393 Issued on September 16, 1980. Estimated Expiration Date: 
July 28, 1998. 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.
July 28, 1998. 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 2235733 3349179 3394698 3884218 Portable sleep inducer Noise generator and transmitter Sleep-inducing/interrupting audio system Patent #: 4047377 InventorsAssigneeApplicationNo. 05/929032 filed on 07/28/1978US Classes:600/559Ear or testing by auditory stimulusExaminersPrimary: Little, WillisAttorney, Agent or FirmInternational ClassesA61B 5/12 (20060101)H04R 25/00 (20060101) AbstractA tinnitus patient is subjected to external sounds of different pitch, one after another, to enable the patient to identify the particular external sound having the same pitch as the subjective tinnitus sound perceived by the patient. Then the patient is provided with a power operated sound generator producing a range of frequencies extending above and below said perceived pitch to mask the tinnitus sound. The sound generator may be worn in the same manner as a hearing aid and may be combined with a hearing aid if necessary.Other References
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