Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4917754 | Method for coating a solid closed surface | Heinz Vetter, Walter Hellmann | 1990-04-17 |
| 4664672 | Transfer printing process for solid objects employing high-pressure gas | Walter Hellmann | 1987-05-12 |
| 4515648 | Method of making a gastight multiple-walled plastic panel | Klaus Kolbe, Walter Hellmann, Hartmut Schikowsky, Heinz Vetter | 1985-05-07 |
| 4483814 | Method and apparatus for forming stretched resin sheet | Walter Hellmann | 1984-11-20 |