Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5123776 | Plastic fillable manhole cover with penetrating handles | Timothy Lang, Mark Stuhlreyer | 1992-06-23 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5123776 | Plastic fillable manhole cover with penetrating handles | Timothy Lang, Mark Stuhlreyer | 1992-06-23 |