Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7518954 | Motion transducer | — | 2009-04-14 |
| 7505369 | Geophone with mass position sensing | — | 2009-03-17 |
| 6922374 | Double-ended geophone | Hendrik A. Laroo | 2005-07-26 |
| 6035711 | Device for determining the direction and speed of an air flow | Johan H. Huijsing, Bastiaan Willem Van Oudheusden, Huibert Jan Verhoeven | 2000-03-14 |
| 4685094 | Lateral compliance device for geophone springs | Frederick A. Vitringa | 1987-08-04 |