Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858462 | Acoustic emission leak source location | John E. Coulter, Michael O. Robertson | 1989-08-22 |
| 4859943 | Inspection method using magnetic particles in a liquid carrier in combination with electrical detection means | Wayne M. Latham, Thomas Powers, Michael O. Robertson | 1989-08-22 |