Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5765952 | Dynamic groove bearing with V-shaped oil barrier groove | Patrick C.J. Rikkelman, Willem Potze | 1998-06-16 |
| 5687481 | Shaving apparatus with electrically adjustable cutting unit | Jan de Boer, Andries T. Reeder, Albertus J. C. Van Der Borst, Pieter De Pooter | 1997-11-18 |
| 5671535 | Shaving apparatus with controllable motor speed | Albertus J. C. Van Der Borst, Jan Tiesinga, Ate K. Damstra | 1997-09-30 |
| 5544414 | Shaving apparatus having contoured heads | Elwin De Valk, Fred Fraij | 1996-08-13 |
| 5444914 | Shaving apparatus | Dirk Hendrik Wevers | 1995-08-29 |
| 5154334 | Method of cleaving a plate of brittle material | Maarten H. Zonneveld, Hans Galenkamp | 1992-10-13 |
| 5132505 | Method of cleaving a brittle plate and device for carrying out the method | Maarten H. Zonneveld, Gerrit C. Verkade, Ireneus H. T. Fierkens, Theodorus J.M.J. Van Gennip | 1992-07-21 |
| 4906959 | Method of dividing a sintered oxidic ferromagnetic ring core and a deflection unit | Maarten H. Zonneveld | 1990-03-06 |