Philip Cheung
28Patents
9h-index
33Co-inventors
75Inventor score
Filing activity: Oct 21, 1985 → Dec 6, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7138884B2 | Circuit package integrating passive radio frequency structure | Electricity | 36 | Expired |
| US7242194B2 | Formation imaging while drilling in non-conductive fluids | Physics | 35 | Expired |
| US4964101A | Method for determining fluid mobility characteristics of earth formations | Physics | 28 | Expired |
| US5522260A | Method and apparatus for determining a depth correction for a logging tool in a well | Physics | 25 | Expired |
| US6891377B2 | Conductive pad around electrodes for investigating the wall of a borehole in a geological formation | Physics | 19 | Expired |
| US7119544B2 | Method and a tool for electrically investigating a wall of a borehole in a geologic formation | Physics | 15 | Expired |
| US7265553B2 | Method and apparatus for imaging earth formation | Physics | 13 | Expired |
| US6919724B2 | Method and apparatus for investigating the wall of a borehole | Physics | 11 | Expired |
| US9678239B2 | System and method for imaging properties of subterranean formations | Physics | 10 | Active |
| US7346454B2 | Method and apparatus for improved depth matching of borehole images or core images | Physics | 8 | Expired |
| US6208214A | Multifunction high frequency integrated circuit structure | Electricity | 8 | Expired |
| US4799200A | Method of acoustically detecting fractures in a borehole | Physics | 8 | Expired |
| US8754651B2 | System and method for imaging properties of subterranean formations | Physics | 7 | Active |
| US7751038B2 | Apparatus and method for obtaining images of a borehole | Physics | 6 | Active |
| US6759920B1 | Multi-layer balun transformer | Electricity | 5 | Expired |
| US7873475B2 | Device and method of measuring depth and azimuth | Fixed Constructions | 5 | Active |
| US8473211B2 | Methods of correcting accelerometer and magnetometer measurements | Fixed Constructions | 4 | Active |
| US9513399B2 | Methods and systems for obtaining an electrical impedivity and/or resistivity image of a subterranean formation | Physics | 3 | Active |
| US8571796B2 | Device and method of determining rate of penetration and rate of rotation | Fixed Constructions | 3 | Active |
| US11047681B2 | Levelling apparatus having an oscillating light generation unit | Physics | 2 | Active |
| US7646480B2 | Borehole imaging | Fixed Constructions | 2 | Active |
| US8718942B2 | Systems and methods for investigating a formation surrounding a borehole | Physics | 2 | Active |
| US11578956B1 | Detecting body spin on a projectile | Mechanical Engineering; Lighting; Heating | 2 | Active |
| US8868349B2 | Methods, systems, and products for quantitatively measuring the degree of concordance between or among microarray probe level data sets | Physics | 1 | Active |
| US8893782B2 | Fluid sensor and method of using same | Physics | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.