Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8187052 | Motorized yo-yo having improved efficiency | Hans W. Van Dan Elzen | 2012-05-29 |
| 7874891 | Motorized yo-yo | Hans W. Van Dan Elzen | 2011-01-25 |
| 7448934 | Motor yo-yo | Hans W. Van Dan Elzen | 2008-11-11 |
| 6155903 | Yo-yo having engagement pads proximate its axle | Hans W. Van Dan Elzen | 2000-12-05 |
| 6089945 | Yo-yo having a multi-image lenticular instruction system | — | 2000-07-18 |
| 5951361 | Yo-yo having engagement pads proximate its axle | Hans W. Van Dan Elzen | 1999-09-14 |
| 5813897 | Yo-yo having an improved tether engagement area | Hans W. Van Dan Elzen | 1998-09-29 |
| 5813898 | Yo-yo having engagement pads proximate its axle | Hans W. Van Dan Elzen | 1998-09-29 |
| 5769686 | Yo-yo having an improved axle and insert retainer | Donald F. Duncan | 1998-06-23 |