Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6145529 | Monitoring steam traps using RF signaling | Michael P. Hellman, James F. Washburn, Donald J. Hume, Andrew F. Drenick | 2000-11-14 |
| 5992436 | Monitoring steam traps using RF signaling | Michael P. Hellman, James F. Washburn, Donald J. Hume, Andrew F. Drenick | 1999-11-30 |