Pingjun Guo
15Patents
7h-index
14Co-inventors
59Inventor score
Filing activity: May 28, 2004 → Feb 18, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7365308B2 | Measurement of formation gas saturation in cased wellbores using pulsed neutron instrumentation | Physics | 23 | Expired |
| US7205535B2 | Elemental gamma ray signature instrument | Physics | 22 | Expired |
| US7254486B2 | Method and apparatus for shale bed detection in deviated and horizontal wellbores | Physics | 13 | Expired |
| US7361887B2 | Measurement of formation gas pressure in cased wellbores using pulsed neutron instrumentation | Physics | 13 | Expired |
| US7372018B2 | Determination of gas pressure and saturation simultaneously | Physics | 10 | Expired |
| US7548817B2 | Formation evaluation using estimated borehole tool position | Physics | 9 | Active |
| US7282704B2 | Method for determining formation porosity and gas saturation in a gas reservoir | Physics | 8 | Expired |
| US7804060B2 | Method and apparatus for fluid influx detection while drilling | Physics | 6 | Active |
| US9383473B2 | Method for cement evaluation with neutron logs | Fixed Constructions | 5 | Active |
| US7402797B2 | Method and apparatus for determining aluminum concentration in earth formations | Physics | 4 | Active |
| US7649169B2 | Method for determining shale bed boundaries and gamma ray activity with gamma ray instrument | Physics | 2 | Expired |
| US9057795B2 | Azimuthal cement density image measurements | Fixed Constructions | 2 | Active |
| US8527204B2 | Volume of investigation based density image processing | Physics | 1 | Active |
| US10705246B2 | Method of rock mineralogy interpretation | Physics | 1 | Active |
| US11788401B2 | Systems and methods for characterizing subsurface formation properties through geochemical logging | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.