Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6811189 | Corrosion seal for threaded connections | Richard W. DeLange, Merle E. Evans, Richard Griffin, William W. Starodub, Gregory K. Otten | 2004-11-02 |
| 5092635 | Buttress thread form | Richard W. DeLange, Merle E. Evans | 1992-03-03 |