Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5285568 | Apparatus for the automatic installation of expander rings into split piston rings | Walter Johann | 1994-02-15 |
| 4462602 | Piston ring with annular expander spring | Bert Brauers, Martin Morsbach | 1984-07-31 |