| Patent No. | Patent Title: |
| 5021613 | Ribbon loudspeaker |
| 5003589 | Headphone-convertible telephone handset |
| 4969197 | Piezoelectric speaker |
| 4969196 | Speaker and horn array |
| 4965831 | Hearing aid housing with retaining frame |
| 4964161 | Cover for a telephone handset |
| 4962537 | Shape adaptable in-the-ear hearing aid |
| 4955729 | Hearing aid which cuts on/off during removal and attachment to th... |
| 4953223 | Speaker mounting system |
| 4949377 | Telephone sterilizer |
| 4949386 | Speaker system |
| 4947439 | Hearing aid comprising a contact spring arrangement |
| 4944005 | Adjustable strap for telephone handset support |
| 4942617 | Earphone cord take-up device |
| 4941179 | Method for the regulation of a hearing aid, a hearing aid and the... |
| 4941180 | Hearing aid with a contact spring configuration |
| 4937876 | In-the-ear hearing aid |
| 4937858 | Telephone handset with electro-acoustic converters electrically ... |
| 4937877 | Modular microphone assembly |
| 4933975 | Dynamic loudspeaker for producing high audio power |
| 4932052 | Self-adjusting headset-handset combination |
| 4926474 | Ergonomic telephone handset |
| 4924504 | Audio speaker |
| 4924502 | Means for stabilizing sound pressure produced at the eardrum unde... |
| 4922541 | Acoustic horn audio reproducer |
| 4922540 | Hearing aid comprising a printed circuit film |
| 4922542 | Headphone comfort |
| 4918736 | Remote control system for hearing aids |
| 4918737 | Hearing aid with wireless remote control |
| 4914750 | Sound transducer |
| 4912769 | Hearing aid comprising a printed circuit board and hearing coil |
| 4912759 | Device for selectively depressing a telephone switch |
| 4907265 | Telephone set with a mechanism for preventing unwanted displaceme... |
| 4905276 | Telephone earpiece extension attachment |
| 4903308 | Audio transducer with controlled flexibility diaphragm |
| 4901353 | Auditory prosthesis fitting using vectors |
| 4901356 | Voice transmission system |
| 4901355 | Combination multiple supported variable position audio intake con... |
| 4899390 | Thin speaker having an enclosure within an open portion and a clo... |
| 4897873 | Multipurpose hinge apparatus for foldable telephones |
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