Masaaki Sofue
13Patents
5h-index
17Co-inventors
63Inventor score
Filing activity: May 25, 1990 → May 22, 2015
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5086422A | Optical disk apparatus | Physics | 49 | Expired |
| US5991251A | Method and apparatus for changing laser beam power of an optical storage device for various types of compact disks | Physics | 9 | Expired |
| US5392274A | Optical pickup device | Physics | 7 | Expired |
| US8928220B2 | White light emitting device and display apparatus | Electricity | 7 | Active |
| US6128259A | Optical pickup apparatus for accurate detection of a tracking error signal | Physics | 6 | Expired |
| US5668793A | Disk cartridge driving apparatus | Physics | 5 | Expired |
| US5875155A | Optical disk unit having reduced recording and reproducing errors | Physics | 3 | Expired |
| US6353583B1 | Signal operational circuit for a multi-beam pick-up device | Physics | 3 | Expired |
| US6147947A | Optical disk apparatus for accessing optical disks with different substrate thicknesses | Physics | 2 | Expired |
| US5737292A | Optical data recording/reproducing device | Physics | 2 | Expired |
| US5926451A | Optical disk unit having reduced wobble | Physics | 2 | Expired |
| US9548426B2 | Semiconductor light-emitting device | Electricity | 1 | Active |
| US9190583B2 | White light emitting device and display apparatus | Electricity | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.