Insert earphones for audiometry
Patent 4763753 Issued on August 16, 1988. Estimated Expiration Date: 
October 4, 2005. 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.
October 4, 2005. 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 1629100 1757938 2389868 3835263 Transducer coupling system Hearing aid with acoustical frequency response modification Mechanically operable acoustic filter Electroacoustic transducer filter assembly Stethoscope with probe sound pick-up and resonant cavity amplification Response-modifying acoustic couplers for hearing aids InventorApplicationNo. 06/784285 filed on 10/04/1985US Classes:181/130, Auditory canal insert381/320, Spectral control381/328, Ear insert381/338, With tubular waveguide or resonant element381/380, Ear insert or bone conduction381/74HEADPHONE CIRCUITSExaminersPrimary: Ng, Jin F.Assistant: Byrd, Danita R. Attorney, Agent or FirmInternational ClassesH04R 1/22 (20060101)H04R 1/10 (20060101) A61B 5/12 (20060101) AbstractEarphones especially adapted for use in audiometry have electroacoustical transducer elements located at a distance from the ear and incorporate coupling paths and chambers so arranged as to eliminate undesirable resonances and to obtain a smooth and accurate frequency response characteristic. | |
