Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11964686 | Switch devices and methods for moving switch rails | David Dworschack | 2024-04-23 |
| 11352032 | Universal retarder system for railway cars | Donald Christopher Noll, William D. Straub | 2022-06-07 |
| 11124171 | Systems and methods for making a modular railroad retarder control system | Richard E. Futter, Jr. | 2021-09-21 |
| 7483683 | Harmonic rejection gated-switching mixer | Hee Wong, Michael Schwartz, Shu-Ing Ju | 2009-01-27 |
| 7325567 | Pneumatic retarder acutator valve | Thomas J. Heyden, Lowell B. Ziese | 2008-02-05 |
| 7299025 | Harmonic rejection gated-switching mixer | Hee Wong, Michael Schwartz, Shu-Ing Ju | 2007-11-20 |
| 7140698 | Hydraulic control and operation system for a railroad car retarder | Lowell B. Ziese, Richard C. Bohme | 2006-11-28 |
| 6422519 | Railroad track switch operator | — | 2002-07-23 |