Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6434896 | Double-walled underground tornado shelter with connection means on the flanges of upper and lower hemispherical halves | — | 2002-08-20 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6434896 | Double-walled underground tornado shelter with connection means on the flanges of upper and lower hemispherical halves | — | 2002-08-20 |