Assignee
Inventors
- Dirk Erickson (11 patents)
- Robert Albertus Brondijk (41 patents)
- Jaconus Petrus Josephus Heemskerk (4 patents)
- Jakob Gerrit Nijboer (46 patents)
- Christiaan Steenbergen (23 patents)
- Charles R. Weirauch (36 patents)
US Patent 7885172 · Granted Feb 8, 2011