Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6823748 | Active pulsation cancellation device for diesel particulate sampling systems | William Martin Silvis, Norbert Kreft, Wolfgang Schindler | 2004-11-30 |
| 6742407 | Particulate sampling probe and dilution tunnel | William Martin Silvis, Norbert Kreft | 2004-06-01 |