Helmke, Jr.; Harold W.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Helmke, Jr.; Harold W..The latest application filed is for "process for producing para-xylene".
- Helmke, Jr.; Harold W. - Kingwood TX
| Patent | Date |
|---|---|
| Process for producing para-xylene Grant 7,626,065 - Ou , et al. December 1, 2 | 2009-12-01 |
| Process for Producing Para-Xylene App 20080306318 - Ou; John Di-Yi ; et al. | 2008-12-11 |
| Process for producing para-xylene Grant 7,439,412 - Ou , et al. October 21, 2 | 2008-10-21 |
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