Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4640803 | Tubular ventilator | Gerhard Feld | 1987-02-03 |
| 4534994 | Process for making fine perforations in plastic sheeting and/or plastic or rubber coated sheet materials | Gerhard Feld | 1985-08-13 |
| 4278871 | Arrangement for effecting the superfine perforation of film-like sheeting with the aid of high-voltage pulses | Gerhard Feld | 1981-07-14 |