David Johnson
27Patents
9h-index
47Co-inventors
75Inventor score
Filing activity: Dec 15, 1981 → Sep 5, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4831600A | Borehole logging method for fracture detection and evaluation | Physics | 68 | Expired |
| US7262859B2 | Systems and methods for measurement optimization | Physics | 48 | Expired |
| US5869755A | Porosity estimation method in carbonate rock | Physics | 30 | Expired |
| US7529152B2 | Use of an effective tool model in sonic logging data processing | Physics | 18 | Expired |
| US7334661B2 | Acoustic logging tool sleeve | Physics | 16 | Expired |
| US7095676B2 | Assessing a solids deposit in an oilfield pipe | Physics | 14 | Expired |
| US5485431A | Measurement of nonlinear formation parameters using sonic borehole tool | Physics | 13 | Expired |
| US7894300B2 | Fluid characterization from acoustic logging data | Physics | 11 | Active |
| US5646379A | Attentuator for borehole acoustic waves | Physics | 10 | Expired |
| US7037494B2 | Formulations and methods for insect control | Human Necessities | 9 | Expired |
| US8553493B2 | Method for permeable zone detection | Physics | 9 | Active |
| US4524432A | Measurement of porosity and formation factor using slow compressional waves | Physics | 9 | Expired |
| US7486070B2 | Devices, systems and methods for assessing porous media properties | Physics | 7 | Active |
| US9625599B2 | Downhole elastic anisotropy measurements | Physics | 6 | Active |
| US9086508B2 | Use of an effective tool model in sonic logging data processing | Physics | 5 | Active |
| US9727371B2 | Emotion processing systems and methods | Physics | 5 | Active |
| US8547789B2 | Method for gas zone detection using sonic wave attributes | Physics | 4 | Active |
| US8730763B2 | Methods and apparatus to optimize parameters in a downhole environment | Physics | 3 | Active |
| US10268507B2 | Emotion processing systems and methods | Physics | 2 | Active |
| US7195709B2 | Detection systems and methods | Emerging Cross-Sectional Technologies | 1 | Expired |
| US8773948B2 | Methods and apparatus to determine slowness of drilling fluid in an annulus | Physics | 1 | Active |
| US10859723B2 | Systems and methods for using Stoneley waves for bottom-hole proximity detection | Physics | 0 | Active |
| US8902048B2 | Radio frequency transmitter adaptors, methods and articles of manufacture | Electricity | 0 | Active |
| US12217084B2 | Emotion processing systems and methods | Physics | 0 | Active |
| US12197181B2 | Temperature control system and methods for operating same | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.