Yoshiaki Sonobe
45Patents
17h-index
55Co-inventors
84Inventor score
Filing activity: Mar 28, 1986 → Jan 21, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6468670B1 | Magnetic recording disk with composite perpendicular recording layer | Emerging Cross-Sectional Technologies | 99 | Expired |
| US8076013B2 | Magnetic recording medium, magnetic recording medium manufacturing method, and magnetic disk | Physics | 79 | Active |
| US7833639B2 | Magnetic recording medium and method for manufacturing magnetic recording medium | Physics | 75 | Active |
| US8367228B2 | Magnetic recording medium having patterned auxiliary recording layer and method for manufacturing such magnetic recording medium | Physics | 73 | Active |
| US8605388B2 | Magnetic recording medium with guard layer between auxiliary and magnetic recording layers and manufacturing method of the magnetic recording medium | Physics | 72 | Active |
| US8003237B2 | Perpendicular magnetic recording disk and manufacturing method thereof | Physics | 72 | Active |
| US8634155B2 | Thermally assisted magnetic recording disk with ion-implant facilitated non-magnetic regions, manufacturing method thereof, and magnetic recording method | Physics | 72 | Active |
| US8298689B2 | Method of manufacturing a perpendicular magnetic recording medium | Physics | 71 | Active |
| US8414966B2 | Magnetic recording medium and manufacturing method of the same | Physics | 70 | Active |
| US8603650B2 | Perpendicular magnetic recording disk and manufacturing method thereof | Electricity | 70 | Expired |
| US7983003B2 | Magnetic recording medium having soft magnetic layer and perpendicular magnetic recording layer | Physics | 70 | Active |
| US7955723B2 | Magnetic recording medium substrate and perpendicular magnetic recording medium | Physics | 70 | Active |
| US8795790B2 | Magnetic recording medium and magnetic recording medium manufacturing method | Physics | 53 | Active |
| US5189574A | Flexible information storing disk apparatus having laminar air flow | Physics | 45 | Expired |
| US4908722A | Digital magnetic recording/reproduction apparatus and method | Physics | 39 | Expired |
| US4646168A | Perpendicular magnetic recording method | Physics | 28 | Expired |
| US6537638B2 | Magnetic recording disk with perpendicular magnetic recording layer and multilayered underlayer structure | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5970602A | Head actuator assembly and method for fabricating the same | Emerging Cross-Sectional Technologies | 17 | Expired |
| US6687067B2 | Perpendicular signal equalization and timing recovery using Hilbert transform | Physics | 7 | Expired |
| US6104578A | Magnetic disk and magnetic disk apparatus having an annular start-stop area with a radial downslope | Physics | 5 | Expired |
| US9349944B2 | Magnetic tunnel junction device | Electricity | 5 | Active |
| US10840435B2 | Magnetic tunnel junction device and magnetic resistance memory device | Electricity | 3 | Active |
| US5863631A | Perpendicular magnetic recording medium and magnetic recording device using the same | Emerging Cross-Sectional Technologies | 3 | Expired |
| US5296980A | Magnetic disk apparatus having recording heads for opposite disk surfaces which are offset from each other | Physics | 3 | Expired |
| US10431279B2 | Magnetoresistive memory device | Electricity | 2 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.