Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5431509 | Interlocking module system | Tighe M. Belden, Philip C. Dretzka, Leonard J. Gramse, Gerald L. Oja, Kent R. Struble +2 more | 1995-07-11 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5431509 | Interlocking module system | Tighe M. Belden, Philip C. Dretzka, Leonard J. Gramse, Gerald L. Oja, Kent R. Struble +2 more | 1995-07-11 |