Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4606121 | Drive mechanism for a vibration-type dry-shaver | Gerhard Diefenbach, Romuald L. Bukoschek | 1986-08-19 |
| 4554471 | Electric motor having a U-shaped stator iron | Leo Bertram, Jan de Boer | 1985-11-19 |
| 4503346 | Electric motor having a stator iron of a bent shape | Leo Bertram | 1985-03-05 |
| 4500825 | Self-starting single-phase synchronous motor | Leo Bertram | 1985-02-19 |
| 4329781 | Shaving apparatus having a shear plate with hair-entry apertures and a cutting unit with lead cutters, which unit is drivable relative to the shear plate | Gerhard Diefenbach | 1982-05-18 |