Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6704423 | Hearing aid assembly having external directional microphone | John S. French, Robert B. Schulein | 2004-03-09 |
| 5493079 | Vocal communication snorkel | — | 1996-02-20 |
| 5363452 | Microphone for use in a vibrating environment | — | 1994-11-08 |
| 4514836 | Brush contact for phonograph tone arm dynamic stabilizer | James H. Kogen | 1985-04-30 |
| 4194590 | Loudspeaker horn with adjustable angle of dispersion | Robert B. Schulein | 1980-03-25 |