Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4611838 | Fluidtight pipe joint | Wolfgang Heilmann, Friedrich Lenze, Friedrich-Oskar Winter | 1986-09-16 |
| 4414247 | Method for surface treatment of threading | Hans Hubecker, Friedrich Lenze | 1983-11-08 |