Issued Patents All Time
Showing 1–18 of 18 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6214488 | Polymer electrolyte membrane and process for the production thereof | Freddy Helmer-Metzmann, Frank Osan, Arnold Schneller, Helmut Ritter, Roland Nolte +1 more | 2001-04-10 |
| 5952118 | PEM fuel cell with structured plates | Roland Nolte | 1999-09-14 |
| 5925477 | Assembly of single cells to form a diaphragm electrode unit | Roland Nolte | 1999-07-20 |
| 5863672 | Polymer electrolyte membrane fuel cell | Roland Nolte | 1999-01-26 |
| 5861221 | Battery shaped as a membrane strip containing several cells | Roland Nolte | 1999-01-19 |
| 5810577 | Catalytic burner | — | 1998-09-22 |
| 5741408 | Polymer electrolyte membrane for use in fuel cells and electrolysis cells | Freddy Helmer-Metzmann, Frank Osan, Arnold Schneller, Helmut Ritter, Roland Nolte +1 more | 1998-04-21 |
| 5733678 | Polymer fuel cell | Roland Nolte | 1998-03-31 |
| 5723086 | Electrode membrane | Roland Nolte, Michael Bauer, Falko Mahlendorf, Volker Peinecke | 1998-03-03 |
| 5709174 | Hot water heater | Juergen Gieshoff, Alexander Schuler | 1998-01-20 |
| 5561202 | Polymer electrolyte membrane, and process for the production thereof | Freddy Helmer-Metzmann, Frank Osan, Arnold Schneller, Helmut Ritter, Roland Nolte +1 more | 1996-10-01 |
| 5464006 | Water heater | Alexander Schuler, Jurgen Gieshoff | 1995-11-07 |
| 5438082 | Polymer electrolyte membrane, and process for the production thereof | Freddy Helmer-Metzmann, Frank Osan, Arnold Schneller, Helmut Ritter, Roland Nolte +1 more | 1995-08-01 |
| 5316643 | Apparatus for the storage and conversion of energy | Jochen Ahn | 1994-05-31 |
| 5258241 | Rebalance cell for a Cr/Fe redox storage system | Angelika Heinzel | 1993-11-02 |
| 4497880 | Recombination device for storage batteries | Helmut Kraft | 1985-02-05 |
| 4394423 | Closure device for lead-acid batteries | — | 1983-07-19 |
| 4378413 | Recombination system for storage batteries | August Winsel, Bernd Udo Bopp | 1983-03-29 |