Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882627 | Noise reduction system | Heinz-Werner Keesen | 1989-11-21 |
| 4839724 | Process for the digital transmission of information | Heinz-Werner Keesen | 1989-06-13 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4882627 | Noise reduction system | Heinz-Werner Keesen | 1989-11-21 |
| 4839724 | Process for the digital transmission of information | Heinz-Werner Keesen | 1989-06-13 |