Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5479961 | Method of plugging a heat exchanger tube and plug therefor | Peter L. DeMarsh | 1996-01-02 |
| 5467824 | Apparatus for and a method of severing multiple casing strings using explosives | Peter L. DeMarsh | 1995-11-21 |
| 4654496 | Underwater oxy-arc cutting system using a non-thermic cutting rod | Peter L. DeMarsh | 1987-03-31 |