Masahiro Birukawa
56Patents
10h-index
34Co-inventors
78Inventor score
Filing activity: Apr 6, 1983 → Feb 23, 2011
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5422874A | Optical recording disk, and recording/reading apparatus using same | Physics | 38 | Expired |
| US6188649A | Method for reading magnetic super resolution type magneto-optical recording medium | Physics | 35 | Expired |
| US5724338A | Rewritable disk-shaped optical recording medium | Physics | 30 | Expired |
| US5341359A | Abnormality detection of a recording medium in a magneto-optical recording system | Physics | 20 | Expired |
| US6982932B2 | Recording/reproducing head and recording/reproducing apparatus incorporating the same | Physics | 19 | Expired |
| US5656370A | Optical recording medium | Emerging Cross-Sectional Technologies | 18 | Expired |
| US5821004A | Magneto-optical recording medium and recording and reading out process using the same | Emerging Cross-Sectional Technologies | 18 | Expired |
| US5582891A | Optical disk substrate with land planes of uniform height | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5706259A | Magneto-optical recording medium for magnetically induced super resolution | Physics | 11 | Expired |
| US6146740A | Magnetic recording medium and method of fabricating the same | Emerging Cross-Sectional Technologies | 10 | Expired |
| US6018511A | Magneto-optical recording medium and readout method of the same | Physics | 9 | Expired |
| US5986977A | Method for reading magnetic super resolution type magneto-optical recording medium | Physics | 7 | Expired |
| US5247495A | Optical magnetic disk with separate regions provided on it | Physics | 7 | Expired |
| US5814418A | Magneto-optical recording medium and method for reading out information from the same | Emerging Cross-Sectional Technologies | 6 | Expired |
| US4497870A | Magneto-optical recording medium | Emerging Cross-Sectional Technologies | 6 | Expired |
| US6018505A | Magneto-optical disc apparatus | Physics | 6 | Expired |
| US5391431A | Magneto-optical recording medium | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5864520A | Magneto-optical recording medium for magnetically induced super resolution | Physics | 4 | Expired |
| US5993937A | Magneto-optic recording medium and method of fabricating the same | Emerging Cross-Sectional Technologies | 4 | Expired |
| US6690626B2 | Optical disk with magnetic layer separated magnetically between tracks and method of magnetically separating tracks of the optical disk | Physics | 4 | Expired |
| US5748592A | Disk drive apparatus and disk storage medium for high density recording | Physics | 3 | Expired |
| US6178151A | Optical head having a reproducing optical system and filter formed by light passing therethrough | Physics | 3 | Expired |
| US6504796B1 | Magneto-optical head having thickness of the core same as a track width | Physics | 3 | Expired |
| US6307819A | Method of reading magneto-optical recording medium | Physics | 2 | Expired |
| US5472758A | Optical recording medium for short-wavelength of laser beam and read/write/erase method using the medium | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.