Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5201151 | Manhole rim and cover assembly | Paul E. Phillips | 1993-04-13 |
| 5160064 | Fuel containment cover assembly | — | 1992-11-03 |
| 5158260 | Vapor vent valve | Bruce Johnson | 1992-10-27 |
| 5141019 | Two stage automatic shutoff valve | Bruce Johnson | 1992-08-25 |
| 5135024 | Roll over pressure relief valve | Bruce Johnson | 1992-08-04 |
| 5095937 | Two stage automatic shut off valve | Bruce Johnson | 1992-03-17 |
| 5072912 | Vapor vent valve | Bruce Johnson | 1991-12-17 |
| 5033519 | Storage tank flow control valve | Rick E. Puffer, Robert P. Whitney, Elmer P. Klop | 1991-07-23 |
| 4793387 | Overfill spillage protection device | Elmer P. Klop | 1988-12-27 |
| 4646773 | Breakaway hose coupling | Elmer P. Klop | 1987-03-03 |
| 4203482 | Process for producing core or mold parts from sand | — | 1980-05-20 |