Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7344788 | Starting a fuel cell system using ambient air and a low voltage blower | Bruce J. Clingerman, Scott Dewey, Rainer Pechtold, Hermann Victor, Bernhard Wnendt +2 more | 2008-03-18 |
| 6214488 | Polymer electrolyte membrane and process for the production thereof | Freddy Helmer-Metzmann, Frank Osan, Arnold Schneller, Helmut Ritter, Konstantin Ledjeff +1 more | 2001-04-10 |
| 5952118 | PEM fuel cell with structured plates | Konstantin Ledjeff | 1999-09-14 |
| 5925477 | Assembly of single cells to form a diaphragm electrode unit | Konstantin Ledjeff | 1999-07-20 |
| 5863672 | Polymer electrolyte membrane fuel cell | Konstantin Ledjeff | 1999-01-26 |
| 5861221 | Battery shaped as a membrane strip containing several cells | Konstantin Ledjeff | 1999-01-19 |
| 5741408 | Polymer electrolyte membrane for use in fuel cells and electrolysis cells | Freddy Helmer-Metzmann, Frank Osan, Arnold Schneller, Helmut Ritter, Konstantin Ledjeff +1 more | 1998-04-21 |
| 5733678 | Polymer fuel cell | Konstantin Ledjeff | 1998-03-31 |
| 5723086 | Electrode membrane | Konstantin Ledjeff, Michael Bauer, Falko Mahlendorf, Volker Peinecke | 1998-03-03 |
| 5561202 | Polymer electrolyte membrane, and process for the production thereof | Freddy Helmer-Metzmann, Frank Osan, Arnold Schneller, Helmut Ritter, Konstantin Ledjeff +1 more | 1996-10-01 |
| 5438082 | Polymer electrolyte membrane, and process for the production thereof | Freddy Helmer-Metzmann, Frank Osan, Arnold Schneller, Helmut Ritter, Konstantin Ledjeff +1 more | 1995-08-01 |