Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5816748 | Method for sealing off ground sites | Klaus Kleiser, Hans-Joachim Bayer, Klaus-Dieter Bilkenroth, Ortwin Caldonazzi, Herbert Baier +2 more | 1998-10-06 |
| 5597045 | Process and tool for laying underground collector mains for liquids and gases | Ingo Sass, Hans-Joachim Bayer, Klaus Kleiser | 1997-01-28 |