Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D866284 | Multi-tool with blade sharpener | Richard S. Constantine | 2019-11-12 |
| D866279 | Blade sharpener | Richard S. Constantine | 2019-11-12 |
| D866278 | Blade sharpener | Richard S. Constantine | 2019-11-12 |
| D866277 | Blade sharpener | Richard S. Constantine | 2019-11-12 |
| D854392 | Foldable blade sharpener | Richard S. Constantine | 2019-07-23 |
| D850232 | Foldable blade sharpener | Richard S. Constantine | 2019-06-04 |
| D848811 | Blade sharpener | Richard S. Constantine | 2019-05-21 |
| 7874896 | Sharpening guide assembly | — | 2011-01-25 |
| D481283 | Offset handle mini-hone | Brian W. Brueggemann | 2003-10-28 |
| D472785 | Sharpening plate insert | Brian W. Brueggemann | 2003-04-08 |
| 6528141 | Support structure and method of assembling same | David G. Powell | 2003-03-04 |
| D465985 | Mini-hone | Brian W. Brueggemann | 2002-11-26 |
| 6402603 | Two-sided abrasive tool | David G. Powell | 2002-06-11 |
| 6261167 | Two-sided abrasive tool and method of assembling same | David G. Powell | 2001-07-17 |
| 5976001 | Interrupted cut abrasive tool | David G. Powell | 1999-11-02 |
| 5919084 | Two-sided abrasive tool and method of assembling same | David G. Powell | 1999-07-06 |