Plexus Ocean Systems Ltd.
12Patents
2Active
12Granted
34Portfolio score
Filing activity: Jun 22, 1987 → Sep 24, 2007 · 2 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4856592A | Annulus cementing and washout systems for wells | Fixed Constructions | 99 | Expired |
| US6571877B1 | Wellhead | Fixed Constructions | 44 | Expired |
| US4938289A | Surface wellhead | Fixed Constructions | 34 | Expired |
| US4794988A | Surface wellhead | Fixed Constructions | 26 | Expired |
| US7128143B2 | Externally activated seal system for wellhead | Fixed Constructions | 24 | Expired |
| US7111688B2 | Clamping well casings | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US6092596A | Clamping well casings | Fixed Constructions | 21 | Expired |
| US7740061B2 | Externally activated seal system for wellhead | Fixed Constructions | 19 | Active |
| US7344162B2 | Pipe joint | Emerging Cross-Sectional Technologies | 14 | Expired |
| US7648176B2 | Pipe joint | Emerging Cross-Sectional Technologies | 11 | Active |
| US6095243A | Washout arrangement for a well | Fixed Constructions | 7 | Expired |
| US7104318B2 | Self-contained centralizer system | Fixed Constructions | 7 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.