Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4729409 | Hexagonal underground electrical conduit | — | 1988-03-08 |
| 4231335 | Control system for regulating air/fuel ratio | Irving H. Hallberg, Ronald R. Ralston, Roy E. Hunninghaus | 1980-11-04 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4729409 | Hexagonal underground electrical conduit | — | 1988-03-08 |
| 4231335 | Control system for regulating air/fuel ratio | Irving H. Hallberg, Ronald R. Ralston, Roy E. Hunninghaus | 1980-11-04 |