Charles Daniel Johnson
9Patents
3h-index
10Co-inventors
54Inventor score
Filing activity: Sep 29, 1994 → Jun 18, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5891030A | System for two dimensional and three dimensional imaging of tubular structures in the human body | Emerging Cross-Sectional Technologies | 307 | Expired |
| US6928314B1 | System for two-dimensional and three-dimensional imaging of tubular structures in the human body | Emerging Cross-Sectional Technologies | 87 | Expired |
| US5485859A | Dishwashing aid for the handicapped | Performing Operations; Transporting | 15 | Expired |
| US9708858B2 | Methods to repair worn or eroded PDC cutters, cutters so repaired, and use of repaired PDC cutters in drill bits or other tools | Fixed Constructions | 1 | Active |
| US10900290B2 | Fixed cutter completions bit | Fixed Constructions | 1 | Active |
| US9289864B2 | Method for repairing or reinforcing cutter pockets of a drill bit | Emerging Cross-Sectional Technologies | 0 | Active |
| US9375827B2 | Methods to repair worn or eroded PDC cutters, cutters so repaired, and use of repaired PDC cutters in drill bits or other tools | Fixed Constructions | 0 | Active |
| US9481057B2 | Method for applying hardfacing to a matrix substrate of a drill bit | Emerging Cross-Sectional Technologies | 0 | Active |
| US9435158B2 | Use of tungsten carbide tube rod to hard-face PDC matrix | Chemistry; Metallurgy | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.