Charles Butterfield
12Patents
6h-index
27Co-inventors
62Inventor score
Filing activity: Oct 31, 1997 → Jul 18, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6799638B2 | Method, apparatus and system for selective release of cementing plugs | Fixed Constructions | 126 | Expired |
| US6318472A | Hydraulic set liner hanger setting mechanism and method | Fixed Constructions | 61 | Expired |
| US6011346A | Apparatus and method for generating electricity from energy in a flowing stream of fluid | Fixed Constructions | 59 | Expired |
| US6571880B1 | Method and multi-purpose apparatus for control of fluid in wellbore casing | Fixed Constructions | 27 | Expired |
| US5967231A | Plug release indication method | Fixed Constructions | 20 | Expired |
| US6796377B2 | Anti-rotation apparatus for limiting rotation of cementing plugs | Fixed Constructions | 14 | Expired |
| US7886831B2 | Apparatus for radially expanding and plastically deforming a tubular member | Fixed Constructions | 5 | Active |
| US8499840B2 | Downhole release joint with radially expandable member | Mechanical Engineering; Lighting; Heating | 5 | Active |
| US7823659B2 | Apparatus and methods for drilling and lining a wellbore | Fixed Constructions | 4 | Active |
| US7080687B2 | Anti-rotation method and apparatus for limiting rotation of cementing plugs | Fixed Constructions | 4 | Expired |
| US8695699B2 | Downhole release joint with radially expandable member | Fixed Constructions | 2 | Active |
| US10018004B2 | Method and apparatus for casing entry | Fixed Constructions | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.