Helmus; Sydney S.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Helmus; Sydney S..The latest application filed is for "annulus pressure controlled test valve with locking annulus pressure operated pressure trapping means".
- Helmus; Sydney S. - London GB2
- Helmus; Sydney S. - Seabrook TX
| Patent | Date |
|---|---|
| Annulus pressure controlled test valve with locking annulus pressure operated pressure trapping means Grant 4,125,165 - Helmus November 14, 1 | 1978-11-14 |
| Test valve having automatic bypass for formation pressure Grant 4,105,075 - Helmus August 8, 1 | 1978-08-08 |
| Removable subsea production test valve assembly Grant 3,870,101 - Helmus March 11, 1 | 1975-03-11 |
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