Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6044766 | Playground carriage | John Underbrink | 2000-04-04 |
| 5816167 | Playground carriage | Paul J. Danforth, Daniel T. York, John Underbrink | 1998-10-06 |
| 5468199 | Sliding-handgrip amusement apparatus | John Underbrink | 1995-11-21 |
| 5443012 | Playground carriage | John Underbrink | 1995-08-22 |