Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5692581 | Anti-slip device for ladder rungs | John R. Nelson | 1997-12-02 |
| 5645912 | Anti-skid staircase treads | John R. Nelson | 1997-07-08 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5692581 | Anti-slip device for ladder rungs | John R. Nelson | 1997-12-02 |
| 5645912 | Anti-skid staircase treads | John R. Nelson | 1997-07-08 |