He; Henry X.
Patent Applications and Registrations
Patent applications and USPTO patent grants for He; Henry X..The latest application filed is for "high temperature back pressure valve".
- He; Henry X. - Edmonton CA
- He; Henry X - Edmonton CA
| Patent | Date |
|---|---|
| Method and apparatus for launching multiple balls in a well Grant 9,103,183 - He , et al. August 11, 2 | 2015-08-11 |
| High Temperature Back Pressure Valve App 20140116720 - He; Henry X. ; et al. | 2014-05-01 |
| Method And Apparatus For Launching Multiple Balls In A Well App 20130032327 - He; Henry X. ; et al. | 2013-02-07 |
| Backup safety flow control system for concentric drill string Grant 8,141,641 - Chan , et al. March 27, 2 | 2012-03-27 |
| Wellhead isolation sleeve assembly Grant 7,823,634 - Chan , et al. November 2, 2 | 2010-11-02 |
| Backup Safety Flow Control System For Concentric Drill String App 20100116501 - Chan; Kwong O. ; et al. | 2010-05-13 |
| Backup safety flow control system for concentric drill string Grant 7,647,989 - Chan , et al. January 19, 2 | 2010-01-19 |
| Backup Safety Flow Control System For Concentric Drill String App 20090294177 - Chan; Kwong O. ; et al. | 2009-12-03 |
| Wellhead Isolation Sleeve Assembly App 20090090515 - Chan; Kwong Onn ; et al. | 2009-04-09 |
uspto.report is an independent third-party trademark research tool that is not affiliated, endorsed, or sponsored by the United States Patent and Trademark Office (USPTO) or any other governmental organization. The information provided by uspto.report is based on publicly available data at the time of writing and is intended for informational purposes only.
While we strive to provide accurate and up-to-date information, we do not guarantee the accuracy, completeness, reliability, or suitability of the information displayed on this site. The use of this site is at your own risk. Any reliance you place on such information is therefore strictly at your own risk.
All official trademark data, including owner information, should be verified by visiting the official USPTO website at www.uspto.gov. This site is not intended to replace professional legal advice and should not be used as a substitute for consulting with a legal professional who is knowledgeable about trademark law.
| 