Katsuro Watanabe
67Patents
16h-index
97Co-inventors
87Inventor score
Filing activity: Sep 24, 1975 → Dec 15, 2020
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US9275672B2 | Magnetic head, magnetic recording method and apparatus for controlling magnetic head with spin torque oscillator in a disk drive | Physics | 87 | Active |
| US6560135B2 | Magnetic semiconductor memory apparatus and method of manufacturing the same | Electricity | 66 | Expired |
| US8472135B1 | Microwave-assisted magnetic recording head having a current confinement structure | Physics | 64 | Active |
| US9355655B1 | Magnetic capping layer structure for a spin torque oscillator | Physics | 35 | Active |
| US5995338A | Magnetoresistive head and magnetic disk apparatus | Physics | 35 | Expired |
| US6636391B2 | Magnetoresistive sensor, magnetic head and magnetic disk apparatus | Physics | 35 | Expired |
| US6172859A | Magnetoresistive head and magnetic disk apparatus | Physics | 30 | Expired |
| US6690163B1 | Magnetic sensor | Emerging Cross-Sectional Technologies | 25 | Expired |
| US7031119B2 | CPP-type magnetic head with less deformation and a magnetic recording/reproducing system using the same | Physics | 22 | Expired |
| US4025132A | Bearing unit | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US9202484B1 | Magnetic head provided spin torque oscillator with low drive voltage for microwave assisted magnetic recording | Physics | 21 | Active |
| US6157526A | Magnetoresistive head and magnetic disk apparatus | Physics | 21 | Expired |
| US6573586B2 | Semiconductor device | Physics | 18 | Expired |
| US9230573B1 | Magnetic recording head with non-magnetic bump structure formed on spin torque oscillator | Physics | 17 | Active |
| US6795277B2 | Magnetic head and magnetic disk drive | Physics | 17 | Expired |
| US7280321B2 | Magnetoresistive head | Physics | 16 | Active |
| US9672846B1 | STO bias control for MAMR head reliability | Physics | 15 | Active |
| US6456466B1 | Magnetic head with shield layer having discontinuous multi-layer or mixed layer and magnetic recording apparatus utilizing the magnetic head | Physics | 15 | Expired |
| US8149548B2 | Magnetic head and manufacturing method thereof | Physics | 14 | Active |
| US9129621B1 | MAMR head with inclined MAMR head body | Physics | 11 | Active |
| US6778363B2 | Magnetoresistive head having longitudinal biasing by providing undirectional magnetic anisotropy | Emerging Cross-Sectional Technologies | 10 | Expired |
| US7154713B2 | CPP-type magnetic head with less deformation and a magnetic recording/reproducing system using the same | Physics | 10 | Expired |
| US8830635B2 | Magnetic head having shield layer(s) with low coefficient of thermal expansion and magnetic storage apparatus having same | Physics | 10 | Active |
| US8917481B2 | High frequency magnetic field assisted magnetic recording head, and method of manufacturing same | Physics | 9 | Active |
| US6671136B2 | Magnetic head and magnetic disk apparatus | Physics | 9 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.