Inventor
HIRUMA KENJI
JP17 patents
⚠️ This page may combine multiple inventors who share the name “HIRUMA KENJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
15 patentsUS5332910AJul 26, 1994
Semiconductor optical device with nanowhiskers
HITACHI LTD222 citations97
US5362972ANov 8, 1994
Semiconductor device using whiskers
HITACHI LTD192 citations96
US5701019ADec 23, 1997
Semiconductor device having first and second stacked semiconductor layers, with electrical contact to the first semiconductor layer
HITACHI LTD97 citations95
US6356572B1Mar 12, 2002
Semiconductor light emitting device
HITACHI LTD48 citations92
US4784451ANov 15, 1988
Waveguide optical switches
HITACHI LTD27 citations92
US4775980AOct 4, 1988
Distributed-feedback semiconductor laser device
HITACHI LTD28 citations92
US4766092AAug 23, 1988
Method of growing heteroepitaxial InP on Si using Sn substrate implantation
HITACHI LTD18 citations82
US4720836AJan 19, 1988
Distributed feedback semiconductor laser
HITACHI LTD12 citations74
US5381027AJan 10, 1995
Semiconductor device having a heterojunction and a two dimensional gas as an active layer
HITACHI LTD18 citations73
US5351128ASep 27, 1994
Semiconductor device having reduced contact resistance between a channel or base layer and a contact layer
HITACHI LTD17 citations73
US5258631ANov 2, 1993
Semiconductor device having a two-dimensional electron gas as an active layer
HITACHI LTD13 citations73
US5025751AJun 25, 1991
Solid film growth apparatus
HITACHI LTD16 citations73
US4835583AMay 30, 1989
Semiconductor device having strained superlattice buffer layers with In-doped GaAs substrate
HITACHI LTD8 citations73
US4933728AJun 12, 1990
Semiconductor optical device
HITACHI LTD13 citations72
US4847573AJul 11, 1989
Optical modulator
HITACHI LTD13 citations72