Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4313625 | Lined pipe assembly | — | 1982-02-02 |
| 4288896 | Method for manufacturing an improved plug valve | E. D. Prueter | 1981-09-15 |
| 4219046 | Plug valve and method | E. D. Prueter | 1980-08-26 |