Friedhelm Makohl
14Patents
10h-index
20Co-inventors
72Inventor score
Filing activity: Aug 1, 1983 → Jun 16, 2003
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6196336A | Method and apparatus for drilling boreholes in earth formations (drilling liner systems) | Fixed Constructions | 204 | Expired |
| US6419033B1 | Apparatus and method for simultaneous drilling and casing wellbores | Fixed Constructions | 188 | Expired |
| US6850068B2 | Formation resistivity measurement sensor contained onboard a drill bit (resistivity in bit) | Emerging Cross-Sectional Technologies | 74 | Expired |
| US5738173A | Universal pipe and tubing injection apparatus and method | Fixed Constructions | 42 | Expired |
| US5890534A | Variable injector | Fixed Constructions | 34 | Expired |
| US5845708A | Coiled tubing apparatus | Fixed Constructions | 30 | Expired |
| US5823267A | Universal pipe and tubing injection apparatus and method | Fixed Constructions | 17 | Expired |
| US4773489A | Core drilling tool for boreholes in rock | Fixed Constructions | 17 | Expired |
| US6032744A | Universal pipe and tubing injection apparatus and method | Fixed Constructions | 16 | Expired |
| US5875850A | Universal pipe and tubing injection apparatus and method | Fixed Constructions | 15 | Expired |
| US6390201B1 | Method of creating a downhole sealing and hanging device | Fixed Constructions | 9 | Expired |
| US7234546B2 | Drilling and cementing casing system | Fixed Constructions | 9 | Expired |
| US5205364A | Process and drilling equipment for sinking a well in underground rock formations | Fixed Constructions | 8 | Expired |
| US4485880A | Direct drive for deep-well drilling | Emerging Cross-Sectional Technologies | 7 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.