Kai Hsu
72Patents
16h-index
100Co-inventors
87Inventor score
Filing activity: Dec 29, 1983 → Jul 13, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7526953B2 | Methods and apparatus for the downhole characterization of formation fluids | Physics | 55 | Active |
| US5796677A | Method of sonic logging while drilling a borehole traversing an earth formation | Physics | 44 | Expired |
| US7305306B2 | System and methods of deriving fluid properties of downhole fluids and uncertainty thereof | Fixed Constructions | 34 | Expired |
| US8024125B2 | Methods and apparatus to monitor contamination levels in a formation fluid | Physics | 33 | Active |
| US4543648A | Shot to shot processing for measuring a characteristic of earth formations from inside a borehole | Physics | 31 | Expired |
| US5047991A | Lithology identification using sonic data | Physics | 30 | Expired |
| US5031155A | Compression and reconstruction of sonic data | Physics | 29 | Expired |
| US4888740A | Differential energy acoustic measurements of formation characteristic | Physics | 28 | Expired |
| US8434356B2 | Fluid density from downhole optical measurements | Fixed Constructions | 23 | Active |
| US5274604A | Method for spatially filtering signals representing formation and channel echoes in a borehole environment | Physics | 23 | Expired |
| US4870627A | Method and apparatus for detecting and evaluating borehole wall fractures | Physics | 22 | Expired |
| US7194902B1 | Apparatus and method for formation evaluation | Physics | 21 | Expired |
| US7222671B2 | Apparatus and method for formation evaluation | Fixed Constructions | 21 | Expired |
| US7805247B2 | System and methods for well data compression | Electricity | 20 | Active |
| US7913556B2 | Methods and apparatus to determine the compressibility of a fluid | Physics | 20 | Active |
| US4951266A | Method of filtering sonic well logging data | Physics | 20 | Expired |
| US7574898B2 | Vibrating wire viscosity sensor | Physics | 16 | Active |
| US4809236A | Method and apparatus for determining the magnitude of components of measurements made from inside a borehole | Physics | 16 | Expired |
| US6459993B1 | Processing sonic waveform measurements from array borehole logging tools | Physics | 12 | Expired |
| US7680600B2 | Method, system and apparatus for formation tester data processing | Physics | 12 | Active |
| US7878243B2 | Method and apparatus for sampling high viscosity formation fluids | Fixed Constructions | 11 | Active |
| US7711488B2 | Methods and apparatus to monitor contamination levels in a formation fluid | Physics | 10 | Active |
| US8335650B2 | Methods and apparatus to determine phase-change pressures | Physics | 10 | Active |
| US9689256B2 | Core orientation systems and methods | Fixed Constructions | 8 | Active |
| US6992768B2 | Optical fluid analysis signal refinement | Physics | 8 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.