High fidelity insert earphones and methods of making same
Patent 5887070 Issued on March 23, 1999. Estimated Expiration Date: 
December 19, 2016. 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 19, 2016. 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 2430229 2971065 3408461 3529102 3671685 3789164 3819860 AGC circuit particularly for a hearing aid Hearing aid Sound transfer from a hearing aid to the human ear drum InventorsApplicationNo. 770647 filed on 12/19/1996US Classes:381/380, Ear insert or bone conduction181/130, Auditory canal insert381/328Ear insertExaminersPrimary: Le, HuyenAttorney, Agent or FirmForeign Patent References
International ClassesH04R 025/00380 322 324 382 126 133 135 149 150 AbstractAn insert earphone is provided in which a piece of foam material is used to resiliently mount a receiver within a chamber portion of a one-piece plastic housing member. The receiver has an output port extending through a central aperture of the piece of foam material and into one end of a passage defined by a tubular portion of the housing member with a damper being disposed in the other end of the passage. The tubular portion is inserted into an ear tip or other coupling device and has an enlarged diameter end section to achieve a locking action. Two such insert earphones may be coupled through cables to a junction unit and filters are provided for enhancing the drive of the earphones at high frequencies, the filters being preferably mounted in the junction unit.Other References
| |
