Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8952727 | Hum generation circuitry | Karl M. Fant | 2015-02-10 |
| 6260403 | Method and apparatus for arching large diameter pipes | — | 2001-07-17 |
| 6000261 | Method and apparatus for portable spiral pipe manufacturing | — | 1999-12-14 |