Pralay Das
18Patents
6h-index
21Co-inventors
66Inventor score
Filing activity: Aug 15, 1986 → Jul 21, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4805449A | Apparatus and method for measuring differential pressure while drilling | Fixed Constructions | 68 | Expired |
| US5386724A | Load cells for sensing weight and torque on a drill bit while drilling a well bore | Physics | 61 | Expired |
| US4739841A | Methods and apparatus for controlled directional drilling of boreholes | Fixed Constructions | 53 | Expired |
| US6839000B2 | Integrated, single collar measurement while drilling tool | Physics | 18 | Expired |
| US6705406B2 | Replaceable electrical device for a downhole tool and method thereof | Fixed Constructions | 16 | Expired |
| US8157002B2 | Slip ring apparatus for a rotary steerable tool | Fixed Constructions | 13 | Active |
| US8550186B2 | Rotary steerable tool employing a timed connection | Fixed Constructions | 6 | Active |
| US8408331B2 | Downhole downlinking system employing a differential pressure transducer | Emerging Cross-Sectional Technologies | 6 | Active |
| US11408783B2 | Integrated collar sensor for measuring mechanical impedance of the downhole tool | Physics | 2 | Active |
| US11680478B2 | Integrated collar sensor for measuring performance characteristics of a drill motor | Physics | 2 | Active |
| US8746366B2 | Downhole downlinking system employing a differential pressure transducer | Emerging Cross-Sectional Technologies | 1 | Active |
| US11512583B2 | Integrated collar sensor for a downhole tool | Physics | 1 | Active |
| US8598195B2 | Peptidomimetic compounds | Chemistry; Metallurgy | 0 | Active |
| US8916723B2 | Substituted cyclohexane-1, 3-dione compounds, process for preparation thereof and its applications | Chemistry; Metallurgy | 0 | Active |
| US11913325B2 | Unitized downhole tool segment | Fixed Constructions | 0 | Active |
| US11440894B2 | Process development for 5-hydroxymethylfurfural (5-HMF) synthesis from carbohydrates | Chemistry; Metallurgy | 0 | Active |
| US11643882B2 | Tubular string with load distribution sleeve for tubular string connection | Fixed Constructions | 0 | Active |
| US11920457B2 | Integrated collar sensor for measuring health of a downhole tool | Fixed Constructions | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.