Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11174688 | Sucker rod guides | Fritz C. Grensing, Christopher W. Damschroder, Diane M. Nielsen, William D. Nielsen | 2021-11-16 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11174688 | Sucker rod guides | Fritz C. Grensing, Christopher W. Damschroder, Diane M. Nielsen, William D. Nielsen | 2021-11-16 |