Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8353323 | Sharpener with autostop feature | Michael J. Schumacher, Theo Muir | 2013-01-15 |
| 8225827 | Sharpener with noise reducing features | Michael J. Schumacher | 2012-07-24 |
| D638273 | Hobby knife with retractable blade | Michael Schumacher, Lisa R. Singer | 2011-05-24 |
| D638474 | Pencil sharpener | Hongjie Yang | 2011-05-24 |
| D588033 | Postage scale | — | 2009-03-10 |