Yoshihiro Kumagai
20Patents
8h-index
38Co-inventors
75Inventor score
Filing activity: Feb 14, 1989 → Jun 29, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6750941B2 | Complex diffraction device | Physics | 169 | Expired |
| US6327089A | Laminated transparent structure for reflective display | Emerging Cross-Sectional Technologies | 113 | Expired |
| US4909777A | Tensioner or toothed belts | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US6628369B2 | Circular polarizer and liquid crystal display | Physics | 18 | Expired |
| US6292295A | Rear projection screen incorporating a prism | Physics | 18 | Expired |
| US6282034A | Optical device and Fresnel lens sheet | Physics | 14 | Expired |
| US5724188A | Lenticular lens sheet | Physics | 11 | Expired |
| US6210872A | Optical film | Physics | 8 | Expired |
| US6108465A | Optical pulse generator | Electricity | 7 | Expired |
| US5432636A | Rear-projection screen | Physics | 6 | Expired |
| US6101021A | Optical pulse generator | Electricity | 4 | Expired |
| US7019804B2 | Liquid crystal cell with twist angle from 180 to 270 degrees and twisted optical compensating element | Physics | 4 | Expired |
| US7061676B2 | Rear projection screen and rear projection display apparatus | Physics | 2 | Expired |
| US8724101B2 | Optical fiber characteristic measuring device and method | Physics | 2 | Active |
| US9221214B2 | Method for producing concave-convex substrate using sol-gel method, sol used in same, method for producing organic EL element using same, and organic EL element obtained thereby | Performing Operations; Transporting | 1 | Active |
| US9109977B2 | Optical fiber characteristics measurement device and method | Physics | 1 | Active |
| US11402296B2 | Optical fiber characteristics measurement apparatus and optical fiber characteristics measurement method | Physics | 1 | Active |
| US7136224B2 | Rear projection screen with shifted lens | Physics | 0 | Expired |
| US12339144B2 | Optical fiber characteristic measurement device, optical fiber characteristic measurement program, and optical fiber characteristic measurement method for measuring characteristics of optical fiber based on Brillouin gain spectrum | Physics | 0 | Active |
| US5432249A | Liquid crystalline polyesters | Chemistry; Metallurgy | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.