Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4832700 | Process and apparatus for preparing dust-free granular material | Jan Kaspar | 1989-05-23 |
| 4188506 | Method and installation for masked speech transmission over a telephone channel | Eduard Brunner, Walter Stofer | 1980-02-12 |