Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4577796 | Method and apparatus for tracking seam welds on pipes and the like | Calvin C. Williamson | 1986-03-25 |
| 4445357 | Pipe press | Ranaldo H. Grimoldi, Calvin C. Williamson, Alfred A. Bottini | 1984-05-01 |
| 4182160 | Hydrostatic pipe tester | Ranoldo H. Grimoldi | 1980-01-08 |