Assignee
Inventors
- Dirk Erickson (11 patents)
- Robert Albertus Brondijk (41 patents)
- Jacomus Petrus Josephus Heemskerk (1 patents)
- Jakob Gerrit Nijboer (46 patents)
- Christiaan Steenbergen (23 patents)
- Charles R. Weirauch (36 patents)
US Patent 7391694 · Granted Jun 24, 2008