Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4826650 | Ultrasonic examination of reactor pressure vessel top guide | David L. Richardson, Peter M. Patterson, Richard W. Perry | 1989-05-02 |
| 4818470 | Apparatus for the ultrasonic examination of shroud hold down bolts | David L. Richardson, Thurman D. Smith, Richard W. Perry | 1989-04-04 |