Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6817351 | Ball launching device | Michael Keller, Craig Markin | 2004-11-16 |
| 6099417 | Apparatus for tossing or teeing a ball | Patrick W. Brown, Paul Madan, John J. Norton | 2000-08-08 |
| 5875555 | Crayon sharpener assembly | John J. Andrisin, III, David D. Hayes, Robert L. Quinlan, Douglas Zlatic | 1999-03-02 |
| 5802948 | Method for sharpening crayons | John J. Andrisin, III, David D. Hayes, Robert L. Quinlan, Douglas Zlatic | 1998-09-08 |