Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4838312 | Three-way valve | Georg Prokscha | 1989-06-13 |
| 4815704 | Ball valve | — | 1989-03-28 |
| 4804207 | Connector pipe segment | Georg Prokscha | 1989-02-14 |
| 4795133 | Ball valve with a ceramic valve ball and ceramic seat rings | Georg Prokscha, Herbert Heidemeyer | 1989-01-03 |