Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9187976 | Apparatus and methods for releasing drilling rig and blowout preventer (BOP) prior to cement bonding | Behrooz Movaffagh, Huahui Wang | 2015-11-17 |
| 9103183 | Method and apparatus for launching multiple balls in a well | Kwong-Onn Chan, Gene Ambrose | 2015-08-11 |
| 9052061 | Well gate valve greasing tool and method of use | Scott Thistle, Christina L. Shannon | 2015-06-09 |
| 8919453 | Scalloped landing ring | Kwong-Onn Chan, Gene Ambrose | 2014-12-30 |
| 8141641 | Backup safety flow control system for concentric drill string | Kwong-Onn Chan | 2012-03-27 |
| 7823634 | Wellhead isolation sleeve assembly | Kwong-Onn Chan, Eugene Borak | 2010-11-02 |
| 7647989 | Backup safety flow control system for concentric drill string | Kwong-Onn Chan | 2010-01-19 |