Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7568897 | Scroll machine with seal | Walter T. Grassbaugh, Christopher Stover, Xiaogeng Su, Hanqing Zhu | 2009-08-04 |
| 7338265 | Scroll machine with single plate floating seal | Walter T. Grassbaugh, Christopher Stover, Xiaogeng Su, Hanqing Zhu | 2008-03-04 |