Issued Patents 2021
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11174688 | Sucker rod guides | Fritz C. Grensing, Christopher W. Damschroder, Michael J. Gedeon, Diane M. Nielsen | 2021-11-16 |
| 11008645 | Wear-resistant Cu—Ni—Sn coating | Fritz C. Grensing, Robert E. Kusner, David J. Krus, Karl R. Ziegler | 2021-05-18 |
| 11008818 | Coupling for rods | Diane M. Nielsen, Fritz C. Grensing | 2021-05-18 |