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| Number | Title | Issue Date |
| 4100992 | Loudspeaker A loudspeaker including a porous diaphragm having an outside edge, an electromagnetic drive means mounted on a central area of the diaphragm for displacing the diaphragm and a hard ring forming a junction between the diaphragm and the drive means with the... | 07/18/1978 |
| 4076098 | Loudspeaker diaphragm This invention relates to loudspeaker diaphragms and methods of making such diaphragms. It is an object of the invention to improve damping of standing waves formed in a loudspeaker diaphragm. To this end a diaphragm in accordance with the invention is ma... | 02/28/1978 |
| 4073366 | Disposable noise reducing hearing aid attachment A disposable noise reducing hearing attachment provided for covering the sound inlet of a hearing aid to reduce the amplitude of random noises such as wind noises and to prevent dirt and moisture from entering the sound inlet. The attachment includes a fl... | 02/14/1978 |
| 4034165 | Transducer with rearwardly disposed damping elements A loudspeaker of the well known conical diaphragm moving coil type is provided with an annular, frusto-conical, cellular damping/deflection element on the magnet or magnet housing thereof. This element interferes with the rearward radiation of sound from ... | 07/05/1977 |
| 4029171 | Membrane for electroacoustic converter systems A diaphragm having a flat multi-layer body with at least one layer of viscoelastic material.... | 06/14/1977 |
| 4020299 | Electro-acoustic transducer diaphragms An electro-acoustic transducer having a sound-generating diaphragm and means for driving the diaphragm in which the diaphragm is provided with perforations filled with damping material to oppose the formation of standing waves in the diaphragm. The perfor... | 04/26/1977 |
| 3997739 | Electrodynamic type electroacoustic transducer An electrodynamic type electroacoustic transducer wherein a diaphragm of a nonmagnetic and insulative material having thereon a series of conductors is disposed between a pair of magnetic circuits opposing one another through a slight clearance so that th... | 12/14/1976 |
| 3976848 | Disposable noise reducing hearing aid attachment A disposable noise reducing hearing aid attachment is provided for covering the sound inlet of a hearing aid to reduce the amplitude of random noises such as wind noises and to prevent dirt and moisture from entering the sound inlet. The attachment includ... | 08/24/1976 |
