Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11408508 | Piston ring | Walter Stumpf, Steffen Hoppe, Ralf Lammers | 2022-08-09 |
| 8337687 | Structured chrome solid particle layer and method for the production thereof | Stefan Duerdoth | 2012-12-25 |
| 8277953 | Production of structured hard chrome layers | Stefan Durdoth | 2012-10-02 |
| 8110087 | Production of a structured hard chromium layer and production of a coating | Stefan Durdoth, Wolfgang Stuckert | 2012-02-07 |
| 7699970 | Production of structured hard chrome layers | Stefan Durdoth | 2010-04-20 |
| 6503642 | Hard-chrome plated layer | — | 2003-01-07 |
| 6209881 | Cast-iron piston ring | Hans-Albert Michel | 2001-04-03 |
| 4846940 | Electrolytically deposited hard chronium coatings | Hans-Jochem Neuhauser, Ulrich Buran | 1989-07-11 |