ERC Industries
11Patents
1Active
11Granted
31Portfolio score
Filing activity: Jun 17, 1996 → Sep 14, 2005 · 1 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5951066A | Connecting system for wellhead components | Mechanical Engineering; Lighting; Heating | 49 | Expired |
| US6012519A | Full bore tubing hanger system | Fixed Constructions | 39 | Expired |
| US6015009A | Casing and tubing hanger system | Fixed Constructions | 23 | Expired |
| US5908046A | Back seat rising stem gate valve | Emerging Cross-Sectional Technologies | 21 | Expired |
| US7275591B2 | Tubing hanger with ball valve in production string | Mechanical Engineering; Lighting; Heating | 21 | Active |
| US6158718A | Gate valve | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US5746453A | High temperature inline expansion joint | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US5743288A | Valve having provision for replacing stem packing while the valve is under pressure | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5984008A | Installable load shoulder for use in a wellhead to support a tubing hanger | Fixed Constructions | 10 | Expired |
| US6176310A | Assembly for sealing the annulus between concentric cylindrical surfaces | Fixed Constructions | 4 | Expired |
| US6484382B1 | Method of providing an internal circumferential shoulder in a cylindrical passageway | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.