Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5398560 | Apparatus for inspecting piping | W. Thor Zollingger, D. Keith Appel | 1995-03-21 |
| 5285689 | Piping inspection instrument carriage with precise and repeatable position control and location determination | Mark Hapstack, Ted R. Talarek, W. Thor Zollinger, Frank M. Heckendorn | 1994-02-15 |