Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4776933 | Electrochemical polishing and pickling method and apparatus | Friedrich Ruhstorfer, Jürgen Menzel | 1988-10-11 |
| 4772367 | Apparatus for and a method of electrochemically polishing pipe inside surfaces | Ju Menzel | 1988-09-20 |