Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12286850 | Full-hole reverse circulation cluster-type down-the-hole (DTH) hammer with multiple independent channels | Yechen Zhao, Chengliang Yan, Fengzheng Jing, Yeshui Zhao, Yechun Zhao | 2025-04-29 |
| 11506266 | Class of over-constrained two-rotation parallel mechanism with same kinematics | Nijia Ye, Bo Hu, Jinjun Zhao, Luzhou Xu, Kai Wang +1 more | 2022-11-22 |
| 11404954 | Pulse width modulation interleaving | Thomas Bekasi, Ismail Agirman, Bassel Al-Annouf, Christopher S. Czerwinski, Jeffrey M. Izard | 2022-08-02 |
| 10554116 | Pulse width modulation upshift at partial load to improve total harmonic cancellation performance for chiller applications | Bassel Al-Annouf | 2020-02-04 |
| 10385852 | Method for soft expulsion of a fluid from a compressor at start-up | Richard T. Pandzik, William Perdikakis, Mark Edward Rollins | 2019-08-20 |
| 9774275 | Systems and methods for space vector pulse width modulation switching using boot-strap charging circuits | William Perdikakis, Thomas Gietzold | 2017-09-26 |
| 9263979 | Method for smooth motor startup | Thomas Gietzold, Subbarao Varigonda, Salih Baris Ozturk | 2016-02-16 |
| 8840383 | Method and apparatus for improved, high-pressure, fluid pump | — | 2014-09-23 |
| 8661891 | Apparatus and method for measuring the liquid level of molten metal | Zhi Xie, Zhenwei Hu, Ying Ci | 2014-03-04 |
| 8643217 | Apparatus and method for boosting output of a generator set | Thomas Gietzold, Jeffrey J. Burchill, Weiqian Hu | 2014-02-04 |
| 8636234 | Flexible spray nozzle for high pressure washers | — | 2014-01-28 |
| 8245957 | Flexible spray nozzle for high pressure washers | — | 2012-08-21 |
| 8104954 | Apparatus and method for measuring the surface temperature of continuous casting billet/slab | Zhi Xie, Zhenwei Hu, Ying Ci | 2012-01-31 |