Eric C. Sullivan
91Patents
23h-index
79Co-inventors
91Inventor score
Filing activity: Dec 28, 1978 → Jan 6, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7395882B2 | Casing and liner drilling bits | Fixed Constructions | 127 | Expired |
| US6540033B1 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Fixed Constructions | 126 | Expired |
| US4726432A | Differentially hardfaced rock bit | Emerging Cross-Sectional Technologies | 86 | Expired |
| US6626251B1 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Fixed Constructions | 68 | Expired |
| US6571886B1 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Fixed Constructions | 62 | Expired |
| US6230822A | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Fixed Constructions | 56 | Expired |
| US7387177B2 | Bearing insert sleeve for roller cone bit | Fixed Constructions | 55 | Active |
| US6543312B2 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Fixed Constructions | 54 | Expired |
| US7066280B2 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Fixed Constructions | 51 | Expired |
| US4899838A | Earth boring bit with convergent cutter bearing | Mechanical Engineering; Lighting; Heating | 48 | Expired |
| US8376065B2 | Monitoring drilling performance in a sub-based unit | Fixed Constructions | 47 | Active |
| US7604072B2 | Method and apparatus for collecting drill bit performance data | Fixed Constructions | 45 | Expired |
| US8087477B2 | Methods and apparatuses for measuring drill bit conditions | Fixed Constructions | 41 | Active |
| US5038640A | Titanium carbide modified hardfacing for use on bearing surfaces of earth boring bits | Emerging Cross-Sectional Technologies | 37 | Expired |
| US6026917A | Earth-boring bit with improved bearing seal | Mechanical Engineering; Lighting; Heating | 36 | Expired |
| US7861805B2 | Conformal bearing for rock drill bit | Mechanical Engineering; Lighting; Heating | 35 | Active |
| US7621346B1 | Hydrostatic bearing | Fixed Constructions | 32 | Active |
| US8245792B2 | Drill bit with weight and torque sensors and method of making a drill bit | Fixed Constructions | 27 | Active |
| US8215384B2 | Bit based formation evaluation and drill bit and drill string analysis using an acoustic sensor | Physics | 27 | Active |
| US7946357B2 | Drill bit with a sensor for estimating rate of penetration and apparatus for using same | Fixed Constructions | 27 | Active |
| US7510026B2 | Method and apparatus for collecting drill bit performance data | Fixed Constructions | 25 | Active |
| US6419032B1 | Method and apparatus for monitoring and recording of the operating condition of a downhole drill bit during drilling operations | Fixed Constructions | 25 | Expired |
| US7497276B2 | Method and apparatus for collecting drill bit performance data | Fixed Constructions | 23 | Active |
| US8056651B2 | Adaptive control concept for hybrid PDC/roller cone bits | Fixed Constructions | 22 | Active |
| US8006785B2 | Casing and liner drilling bits and reamers | Fixed Constructions | 21 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.