Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D936117 | Step drill bit | Douglas W. Allen, Courtney McCool, Richard Hohnl, Jr. | 2021-11-16 |
| D933443 | Driver bit | James J. Van Essen, Michael J. Zimmermann | 2021-10-19 |
| 10953521 | Driver | Michael J. Zimmermann | 2021-03-23 |