Andrew Hayman
27Patents
8h-index
23Co-inventors
75Inventor score
Filing activity: Jun 15, 1989 → Oct 14, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4928269A | Determining impedance of material behind a casing in a borehole | Physics | 40 | Expired |
| US7242194B2 | Formation imaging while drilling in non-conductive fluids | Physics | 35 | 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 |
| US8901932B2 | Tool for imaging a downhole environment | Physics | 8 | Active |
| US8754651B2 | System and method for imaging properties of subterranean formations | Physics | 7 | Active |
| US7382136B2 | Shielded apparatus for reducing an electrical field generated by a pad during electrically exploring geological formations | Physics | 7 | Expired |
| US9400339B2 | Apparatus and method for measuring electrical properties of an underground formation | Physics | 6 | Active |
| US8901933B2 | Tool for imaging a downhole environment | Physics | 6 | Active |
| US9885805B2 | Method and system for calibrating a downhole imaging tool | Physics | 5 | Active |
| US8776878B2 | Sensor for determining downhole parameters and methods for using same | Physics | 4 | Active |
| US8767506B2 | Using higher order harmonics to determine acoustic impedance of material behind borehole casings | Physics | 4 | Active |
| US8933700B2 | Tool for imaging a downhole environment | Physics | 3 | Active |
| US9594177B2 | Using higher order harmonics to determine acoustic impedance of material behind borehole casings | Physics | 3 | Active |
| US8994377B2 | Tool for imaging a downhole environment | Physics | 3 | Active |
| US9903973B2 | Systems and methods for removing coherent noise in log data | Physics | 2 | Active |
| US9671517B2 | Tool for imaging a downhole environment | Physics | 1 | Active |
| US9921337B2 | Method and system for calibrating a downhole imaging tool | Physics | 1 | Active |
| US11473419B2 | Flexural wave measurement for thick casings | Physics | 1 | Active |
| US9841525B2 | System and method for measuring downhole parameters | Physics | 1 | Active |
| US9840911B2 | Cement evaluation | Physics | 0 | Active |
| US12055032B2 | Flexural wave measurement for thick casings | Physics | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.