Minimum energy tinnitus masker
Patent 5403262 Issued on April 4, 1995. Estimated Expiration Date: 
March 9, 2013. 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.
March 9, 2013. 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 2753397 3394698 3647968 Phase lock loop multitone interference canceling system Sound producing device Tinnitus masker Digitally driven audio effects generator Device and method for effecting rhythmic body activity Tinnitus-masker Patent #: 5167236 InventorAssigneeApplicationNo. 028326 filed on 03/09/1993US Classes:600/28, Audio (e.g., heartbeat, "white noise", etc.)600/559, Ear or testing by auditory stimulus607/55Promoting auditory functionExaminersPrimary: Cohen, Lee S.Assistant: Lacyk, John P. Attorney, Agent or FirmForeign Patent References
International ClassA61B 005/00AbstractA tinnitus masking device and method for producing a masking signal with a selected center frequency, selected bandwidth, and selected volume is provided. A random noise generator and a clock circuit are employed in conjunction with a switched capacitance filter bank to produce a masking signal with the selected center frequency and selected bandwidth. The masking signal is then received by a volume control unit and then amplified for delivery to the tinnitus sufferer's ear or ears by speakers or headphones. Additionally, the tinnitus masking device may include a timer and fade out unit.Other References
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