Inventor
OHISHI AKIO
JP6 patents
⚠️ This page may combine multiple inventors who share the name “OHISHI AKIO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
5 patentsUS5340637AAug 23, 1994
Optical device diffraction gratings and a photomask for use in the same
HITACHI LTD67 citations94
US4819036AApr 4, 1989
Semiconductor device
HITACHI LTD25 citations92
US4905057AFeb 27, 1990
Semiconductor devices
HITACHI LTD10 citations73
US4841531AJun 20, 1989
Semiconductor laser device
HITACHI LTD13 citations72
US5034942AJul 23, 1991
System having a function of reproducing optical information
HITACHI LTD5 citations61