Hydril Company
280Patents
36Active
280Granted
44Portfolio score
Filing activity: Dec 27, 1971 → Sep 27, 2023 · 19 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6230824A | Rotating subsea diverter | Fixed Constructions | 161 | Expired |
| US4626135A | Marine riser well control method and apparatus | Fixed Constructions | 160 | Expired |
| US4373754A | Threaded connector | Mechanical Engineering; Lighting; Heating | 156 | Expired |
| US4444250A | Flow diverter | Emerging Cross-Sectional Technologies | 155 | Expired |
| US4703954A | Threaded pipe connection having wedge threads | Mechanical Engineering; Lighting; Heating | 154 | Expired |
| US6325159A | Offshore drilling system | Emerging Cross-Sectional Technologies | 153 | Expired |
| US4026583A | Stainless steel liner in oil well pipe | Emerging Cross-Sectional Technologies | 144 | Expired |
| US6102673A | Subsea mud pump with reduced pulsation | Emerging Cross-Sectional Technologies | 143 | Expired |
| US3989284A | Tubular connection | Mechanical Engineering; Lighting; Heating | 132 | Expired |
| US6607220B2 | Radially expandable tubular connection | Mechanical Engineering; Lighting; Heating | 116 | Expired |
| US4098341A | Rotating blowout preventer apparatus | Mechanical Engineering; Lighting; Heating | 115 | Expired |
| US4917409A | Tubular connection | Fixed Constructions | 114 | Expired |
| US6622797B2 | Apparatus and method to expand casing | Mechanical Engineering; Lighting; Heating | 104 | Expired |
| US4502534A | Flow diverter | Emerging Cross-Sectional Technologies | 103 | Expired |
| US4681133A | Rotatable ball valve apparatus and method | Emerging Cross-Sectional Technologies | 97 | Expired |
| USRE34467E | Tubular connection | General | 97 | Expired |
| US7234530B2 | Ram BOP shear device | Fixed Constructions | 92 | Expired |
| US4646836A | Tertiary recovery method using inverted deviated holes | Fixed Constructions | 92 | Expired |
| US4646844A | Diverter/bop system and method for a bottom supported offshore drilling rig | Fixed Constructions | 90 | Expired |
| US4832126A | Diverter system and blowout preventer | Emerging Cross-Sectional Technologies | 89 | Expired |
| US5454605A | Tool joint connection with interlocking wedge threads | Fixed Constructions | 85 | Expired |
| US4605076A | Method for forming boreholes | Fixed Constructions | 83 | Expired |
| US4703807A | Rotatable ball valve apparatus and method | Emerging Cross-Sectional Technologies | 82 | Expired |
| US4478287A | Well control method and apparatus | Fixed Constructions | 81 | Expired |
| US5655745A | Low profile and lightweight high pressure blowout preventer | Emerging Cross-Sectional Technologies | 81 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.