Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5922231 | Voltage surge resistant positive temperature coefficient heater | Eric Karst | 1999-07-13 |
| 5009547 | Water spray for cement finisher | — | 1991-04-23 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5922231 | Voltage surge resistant positive temperature coefficient heater | Eric Karst | 1999-07-13 |
| 5009547 | Water spray for cement finisher | — | 1991-04-23 |