Roger Johns
6Patents
3h-index
13Co-inventors
54Inventor score
Filing activity: Jul 17, 1992 → Aug 2, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5305837A | Air percussion drilling assembly for directional drilling applications | Fixed Constructions | 49 | Expired |
| US5394952A | Core cutting rock bit | Fixed Constructions | 25 | Expired |
| USRE36166E | Air percussion drilling assembly for directional drilling applications | General | 14 | Expired |
| US11453601B2 | Frac sand separator system | Chemistry; Metallurgy | 3 | Active |
| US10907458B2 | Frac flow-back control and/or monitoring system and methods | Fixed Constructions | 0 | Active |
| US10415357B2 | Frac flow-back control and/or monitoring system and methods | Fixed Constructions | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.