James A. Grau
31Patents
11h-index
34Co-inventors
75Inventor score
Filing activity: Sep 15, 1980 → Sep 2, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4810876A | Logging apparatus and method for determining absolute elemental concentrations of subsurface formations | Physics | 36 | Expired |
| US4390783A | Spectroscopic analysis with background compensation | Physics | 34 | Expired |
| US4661701A | Methods and apparatus for borehole-corrected spectral analysis of earth formations | Physics | 29 | Expired |
| US5097123A | Broad energy spectra neutron source for logging and method | Physics | 28 | Expired |
| US4394574A | Methods and apparatus for constituent analysis of earth formations | Physics | 26 | Expired |
| US4587424A | Method for investigating the composition of an earth formation traversed by a borehole | Physics | 20 | Expired |
| US5021653A | Geochemical logging apparatus and method for determining concentrations of formation elements next to a borehole | Physics | 19 | Expired |
| US5171986A | Methods and apparatus for calibration of BGO scintillator gamma ray energy spectra | Physics | 19 | Expired |
| US5521378A | Method and apparatus for gamma ray logging of underground formations | Physics | 16 | Expired |
| US7366615B2 | Methods and apparatus using both nuclear capture and inelastic spectroscopy in deriving elemental concentrations | Physics | 14 | Active |
| US10247849B2 | Method for measuring formation water salinity from within a borehole | Physics | 12 | Active |
| US9599729B2 | Gamma-ray detectors for downhole applications | Physics | 6 | Active |
| US8536517B2 | Scintillator based radiation detection | Physics | 5 | Active |
| US8431885B2 | Gamma-ray detectors for downhole applications | Physics | 5 | Active |
| US9575208B2 | Geological constituent estimation using calculated spectra relationships | Physics | 4 | Active |
| US10429540B2 | Combining inelastic and capture gamma ray spectroscopy for determining formation elemental | Physics | 4 | Active |
| US8963073B2 | Nuclear spectroscopy corrections using multiple standards and spatial regions | Physics | 4 | Active |
| US9541668B2 | Environmental corrections in nuclear spectroscopy using variable element ratio | Physics | 3 | Active |
| US9851468B2 | Hydrocarbon saturation from total organic carbon logs derived from inelastic and capture nuclear spectroscopy | Physics | 3 | Active |
| US9835759B2 | Neutron-induced gamma-ray spectroscopy that accounts for environmental dependence of inelastic gamma-ray emission spectra | Physics | 3 | Active |
| US9568639B2 | Borehole tool calibration method | Physics | 2 | Active |
| US9417355B2 | Composition-matched inelastic or capture spectroscopy tool | Physics | 2 | Active |
| US12025767B2 | Measuring spectral contributions of elements in regions in and about a borehole using a borehole spectroscopy tool | Physics | 2 | Active |
| US8546749B2 | Intrinsic radioactivity in a scintillator as count rate reference | Physics | 1 | Active |
| US9835758B2 | Method for filtering for interpretation of neutron induced gamma ray measurements | Physics | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.