Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5073936 | Stereophonic microphone system | Fritz Sippl, Sandor Szabo | 1991-12-17 |
| 5031216 | Device for stereophonic recording of sound events | Fritz Sippl, Sandor Szabo | 1991-07-09 |
| 4904078 | Eyeglass frame with electroacoustic device for the enhancement of sound intelligibility | — | 1990-02-27 |
| 4809811 | Ear pad construction for earphones | — | 1989-03-07 |
| 4571746 | Collapsible headband | — | 1986-02-25 |
| 4466117 | Microphone for stereo reception | — | 1984-08-14 |
| 4389542 | Orthodynamic headphone | — | 1983-06-21 |
| 4340787 | Electroacoustic transducer | — | 1982-07-20 |
| 4338489 | Headphone construction | — | 1982-07-06 |
| 4278852 | Earphone construction | — | 1981-07-14 |
| 4256922 | Stereophonic effect speaker arrangement | — | 1981-03-17 |