Issued Patents All Time
Showing 25 most recent of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5717301 | Electric motor assembly | Albrecht Griebhammer | 1998-02-10 |
| 5502359 | Small motor with permanent-magnet rotor | Theo Hu/ sgen | 1996-03-26 |
| 5164654 | Solar energy operated automatic charge device for electric appliances | Leo Bertram, Theodor Husgen | 1992-11-17 |
| 5158562 | Epilating device having epilating rollers rotatingly drivable in opposite directions | Leo Bertram, Romuald L. Bukoschek | 1992-10-27 |
| 5121020 | Rotor for an electric motor | Leo Bertram, Romuald L. Bukoschek | 1992-06-09 |
| 5118977 | Two-pole single-phase synchronous motor with permanent-magnet rotor, and starting device for use in the single-phase synchronous motor | Leo Bertram | 1992-06-02 |
| 5022315 | Small electric household utensil for the production of foods by mixing by stirring | Leo Bertram, Romuald L. Bukoschek | 1991-06-11 |
| 5012147 | Domestic vibration apparatus with lever drive | Leo Bertram, Romuald L. Bukoschek | 1991-04-30 |
| 4979297 | Rotary shaving head for an electric shaving apparatus | Leo Bertram | 1990-12-25 |
| 4868435 | Single phase synchronous motor vibration apparatus | Gerhard Diefenbach, Romuald L. Bukoschek | 1989-09-19 |
| 4827171 | Single-phase synchronous motor comprising a two-pole permanent-magnetic rotor and an eddy-current intermediate rotor | Leo Bertram | 1989-05-02 |
| 4827204 | Synchronous motor with dynamic damping | Romuald L. Bukoschek | 1989-05-02 |
| 4812691 | Device for improving the stability of rotation of the rotor of a single-phase synchronous motor | Leo Bertram, Gerhard Diefenbach | 1989-03-14 |
| 4807365 | Method for making the shaving head of a dry-shaving apparatus | Leo Bertram, Romuald L. Bukoschek, Reinhard Huszar | 1989-02-28 |
| 4803390 | Dual motor drive arrangement for a small domestic appliance | Leo Bertram, Romuald L. Bukoschek | 1989-02-07 |
| 4791327 | Drive mechanism for a domestic vibration apparatus | Leo Bertram, Romuald L. Bukoschek | 1988-12-13 |
| 4759192 | Domestic appliance comprising a tool | Leo Bertram, Romuald L. Bukoschek | 1988-07-26 |
| 4760297 | Small appliance driven by unidirectional single-phase synchronous motor | Peter Steiner | 1988-07-26 |
| 4714851 | Single-phase synchronous motor comprising a two-pole permanent-magnet rotor | Leo Bertram | 1987-12-22 |
| 4709752 | Cooling arrangement for heat generating electrical components | Johann Schroder, Klaus Gawron, Leo Bertram | 1987-12-01 |
| 4691132 | Synchronous motor with two-pole permanent-magnet soft-magnetic-core rotor | Leo Bertram | 1987-09-01 |
| 4684840 | Synchronous motor having a permanent-magnet modular rotor | Leo Bertram | 1987-08-04 |
| 4636676 | Single-phase synchronous motor with two-pole permanent-magnet rotor | Leo Bertram, Gerhard Diefenbach | 1987-01-13 |
| 4628607 | Vibration dry shaving apparatus driven by a bipolar uniphase synchronous motor | Leo Bertram, Romuald L. Bukoschek | 1986-12-16 |
| 4621423 | Shear head of a dry-shaver comprising a shear foil which is clamped so as to be curved | Romuald L. Bukoschek | 1986-11-11 |