Hallden; Donald F.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hallden; Donald F..The latest application filed is for "reduced torque gate valve with roller screw".
- Hallden; Donald F. - Houston TX
- Hallden; Donald F. - Mesquite TX
- Hallden; Donald F. - Garland TX
| Patent | Date |
|---|---|
| Reduced torque gate valve with roller screw Grant 6,918,574 - Hallden , et al. July 19, 2 | 2005-07-19 |
| Reduced torque gate valve with roller screw App 20030038266 - Hallden, Donald F. ; et al. | 2003-02-27 |
| Method of producing high strength sucker rod coupling Grant 5,334,268 - Hermanson , et al. August 2, 1 | 1994-08-02 |
| Pressure responsive safety system for fluid lines Grant 4,215,746 - Hallden , et al. August 5, 1 | 1980-08-05 |
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