Hirofumi Shimizu
46Patents
11h-index
89Co-inventors
78Inventor score
Filing activity: Feb 8, 1977 → Jul 22, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4116719A | Method of making semiconductor device with PN junction in stacking-fault free zone | Emerging Cross-Sectional Technologies | 26 | Expired |
| US7028386B2 | Rotor body and production method thereof | Emerging Cross-Sectional Technologies | 24 | Expired |
| US6561941B2 | Infinite speed ratio transmission | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US6174222A | Process for fabrication of semiconductor device, semiconductor wafer for use in the process and process for the preparation of the wafer | Electricity | 20 | Expired |
| US5916293A | Lockup control apparatus | Mechanical Engineering; Lighting; Heating | 17 | Expired |
| US6242323A | Semiconductor device and process for producing the same | Electricity | 15 | Expired |
| US6226079A | Defect assessing apparatus and method, and semiconductor manufacturing method | Physics | 15 | Expired |
| US6559027B2 | Semiconductor device and process for producing the sme | Electricity | 15 | Expired |
| US6569051B2 | Infinite speed ratio continuously variable transmission | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US6057241A | Method of manufacturing a semiconductor integrated circuit device | Electricity | 13 | Expired |
| US5111743A | Screen process printing plate for printing with high precision | Electricity | 11 | Expired |
| US7355311B2 | Rotor of axial gap motor and method of producing same | Electricity | 9 | Expired |
| US4961877A | Solid silicone defoamer | Performing Operations; Transporting | 9 | Expired |
| US7342986B2 | Digital PLL device | Emerging Cross-Sectional Technologies | 8 | Expired |
| US5152219A | Screen process printing apparatus using a screen reinforced by strips | Electricity | 8 | Expired |
| US6881646B2 | Semiconductor device and process for producing the same | Electricity | 7 | Expired |
| US6517461B2 | Infinitely variable transmission | Mechanical Engineering; Lighting; Heating | 7 | Expired |
| US6565481B2 | Input torque limiting device for an infinitely variable transmission | Mechanical Engineering; Lighting; Heating | 6 | Expired |
| US9566851B2 | Mounting structure of high voltage unit for electric vehicle | Emerging Cross-Sectional Technologies | 5 | Active |
| US7001297B2 | Hybrid transmission | Emerging Cross-Sectional Technologies | 5 | Expired |
| US6302819A | Infinite speed ratio transmission device | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US6848831B2 | Rotation shaft support structure of a motor/generator | Mechanical Engineering; Lighting; Heating | 4 | Expired |
| US6958027B2 | Hybrid transmission | Emerging Cross-Sectional Technologies | 3 | Expired |
| US6904331B2 | Method of paper machine control and apparatus for the method | Textiles; Paper | 3 | Expired |
| US8680826B2 | Optimized conversion efficiency for regulator apparatus with plural parallel regulators | Emerging Cross-Sectional Technologies | 3 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.