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| Number | Title | Issue Date |
| 7567680 | Dual-diaphragm speaker assemblies with acoustic passageways and mobile terminals including the same A mobile terminal includes a portable terminal housing and a speaker housing positioned in the portable terminal housing. The speaker housing includes a first micro-speaker having a first frequency response and a second micro-speaker having a second frequency respon... | 07/28/2009 |
| 7248173 | Smoke detector A dark chamber is adapted to accommodate smoke particles. A photo emitter and a photo detector are disposed in the dark chamber. In a first region, a region where light emitted from the photo emitter passes and a region where the photo detector is capable of detecti... | 07/24/2007 |
| 7224812 | Condenser microphone and method for making the same A condenser microphone includes a condenser housing defining an inner space therein, and a variable gap condenser enclosed in the condenser housing. The variable gap condenser includes an insulating substrate, a conductive fixed back plate mounted securely on the in... | 05/29/2007 |
| 7212641 | Electromechanical acoustic liner A multi-resonator-based system responsive to acoustic waves includes at least two resonators, each including a bottom plate, side walls secured to the bottom plate, and a top plate disposed on top of the side walls. The top plate includes an orifice so that a portio... | 05/01/2007 |
| 7207071 | Ventilated helmet system A ventilation system for a helmet that allows for ventilation of the interior of a helmet. A ventilation system for the cheek bar portion of a helmet, including a motorcycle helmet. The ventilation system may include ribbed passageways that facilitate airflow along ... | 04/24/2007 |
| 7043040 | Hearing aid apparatus A hearing aid apparatus is intended for sound transmission from one side of the head to the cochlea on the other side of the head for rehabilitation of patients with unilateral hearing loss. The hearing aid apparatus is based on the bone conducting principle for bon... | 05/09/2006 |
| 7043035 | Miniature microphone A microphone for converting sound into an electrical signal includes a generally cylindrical housing including an inlet for receiving sound, an inner backplate, and an outer backplate. The inner and outer backplates are generally cylindrical and substantially concen... | 05/09/2006 |
| 5136657 | Sound device mounted in a helmet A helmet having a sound device therein, includes a shell of a rigid material for protecting the head of a wearer, a liner mounted inside the shell and filled with a buffer material, and a speaker mounted inside a lower end portion of the shell or inside o... | 08/04/1992 |
