Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4614445 | Metal-lubricated helical-groove bearing comprising an anti-wetting layer | Jan Gerkema | 1986-09-30 |
| 4562587 | X-Ray tube having a rotary anode | Jan Gerkema, Anton K. Niessen | 1985-12-31 |