Assignee
Inventors
- Isaac Heertje (4 patents)
- Hendricus Amoldus Comelis Hendrickx (1 patents)
- Albertje Johanna Knoops (4 patents)
- Elias Comelis Royers (1 patents)
- Hessel Turksma (8 patents)
- Leendert Hendrik Wesdorp (16 patents)
US Patent 6368653 · Granted Apr 9, 2002