Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4894863 | Method for gain control in telephone sets having an electronic speech circuit, and apparatus for performing the method | Emil Navratil | 1990-01-16 |
| 4847898 | Speech circuit configuration | Emil Navratil | 1989-07-11 |