Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9103183 | Method and apparatus for launching multiple balls in a well | Henry He, Kwong-Onn Chan | 2015-08-11 |
| 8919453 | Scalloped landing ring | Henry He, Kwong-Onn Chan | 2014-12-30 |