Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5391341 | Process and binder for the manufacture of ceramic shells for use as molds | Heinrich Ballewski, Herbert Graf | 1995-02-21 |
| 4766948 | Process for casting aluminum alloys | Friedrich Behr, Heinrich Ballewski | 1988-08-30 |