Chang; Harry L.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Chang; Harry L..The latest application filed is for "multi-stage enhanced oil recovery process".
- Chang; Harry L. - Plano TX
- Chang; Harry L. - Dallas TX
| Patent | Date |
|---|---|
| Multi-stage enhanced oil recovery process Grant 8,991,493 - Chang March 31, 2 | 2015-03-31 |
| Multi-Stage Enhanced Oil Recovery Process App 20140000885 - Chang; Harry L. | 2014-01-02 |
| Enhanced oil recovery process with reduced gas drive mobility Grant 4,773,484 - Chang , et al. September 27, 1 | 1988-09-27 |
| Oil recovery by waterflooding with improved mobility control Grant 4,018,281 - Chang April 19, 1 | 1977-04-19 |
| Oil recovery by microemulsion injection Grant 4,008,769 - Chang February 22, 1 | 1977-02-22 |
| Oil recovery by alkaline-surfactant waterflooding Grant 4,004,638 - Burdyn , et al. January 25, 1 | 1977-01-25 |
| Secondary oil recovery by waterflooding with extracted petroleum acids Grant 3,929,190 - Chang , et al. December 30, 1 | 1975-12-30 |
| Alkaline waterflooding process Grant 3,927,716 - Burdyn , et al. December 23, 1 | 1975-12-23 |
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.
| 