Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4934403 | Readily inspectable and cleanable emergency valve for storage tank | Frank Petersen | 1990-06-19 |
| 4709901 | Fluid power operated sliding gate valve system for tank trucks, pipelines, storage tanks and the like | Karl B. Pierson, William Geraint Jones | 1987-12-01 |