Lister; Roy D.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Lister; Roy D..The latest application filed is for "spiral ramp hydrocyclone".
- Lister; Roy D. - Winston Salem NC US
- Lister, Roy D. - Forth Worth TX
- Lister; Roy D. - Fort Worth TX
| Patent | Date |
|---|---|
| Spiral ramp hydrocyclone Grant 8,955,691 - Lister February 17, 2 | 2015-02-17 |
| Spiral ramp hydrocyclone App 20130048556 - Lister; Roy D. | 2013-02-28 |
| Apparatus and method for separation of gases App 20030221558 - Lister, Roy D. ; et al. | 2003-12-04 |
| Drilling deck bushing Grant 4,324,438 - Lister April 13, 1 | 1982-04-13 |
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