Inventor
MATSUMURA HIROYOSHI
JP44 patents
⚠️ This page may combine multiple inventors who share the name “MATSUMURA HIROYOSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
32 patentsUS5867809AFeb 2, 1999
Electric appliance, printed circuit board, remained life estimation method, and system thereof
HITACHI LTD142 citations97
US4426129AJan 17, 1984
Optical fiber and method of producing the same
HITACHI LTD51 citations96
US5340637AAug 23, 1994
Optical device diffraction gratings and a photomask for use in the same
HITACHI LTD67 citations94
US4813757AMar 21, 1989
Optical switch including bypass waveguide
HITACHI LTD42 citations93
US4803692AFeb 7, 1989
Semiconductor laser devices
HITACHI LTD28 citations93
US4792197ADec 20, 1988
Fabrication method and equipment for diffraction gratings
HITACHI LTD39 citations93
US4737003AApr 12, 1988
Optical switching device utilizing multiple quantum well structures between intersecting waveguides
HITACHI LTD42 citations93
US4730896AMar 15, 1988
Member for infrared ray transmission
HITACHI LTD25 citations93
US4693543ASep 15, 1987
Optical integrated circuit
HITACHI LTD31 citations93
US4835581AMay 30, 1989
Electron gas hole gas tunneling transistor device
HITACHI LTD30 citations92
US4819036AApr 4, 1989
Semiconductor device
HITACHI LTD25 citations92
US4631402ADec 23, 1986
Optical electric-field measuring apparatus
HITACHI LTD34 citations92
US4612294ASep 16, 1986
Glass material for optical fibers used in infrared region
HITACHI LTD28 citations92
US4604577AAug 5, 1986
Temperature-compensated magnetic field measuring instrument
HITACHI LTD39 citations92
US4581579AApr 8, 1986
Optical magnetic-field measuring apparatus having improved temperature characteristics
HITACHI LTD43 citations92
US4861130AAug 29, 1989
Optical modulating device utilizing polariton substance
HITACHI LTD23 citations82
US4766092AAug 23, 1988
Method of growing heteroepitaxial InP on Si using Sn substrate implantation
HITACHI LTD18 citations82
US4505729AMar 19, 1985
Method of producing optical fiber preform
HITACHI LTD19 citations82
US4900134AFeb 13, 1990
Optical device
HITACHI LTD16 citations74
US4887877ADec 19, 1989
Optical devices and optical integrated circuits
HITACHI LTD19 citations74
US4828592AMay 9, 1989
Polarization plane maintaining optical fiber fabricating method
HITACHI LTD9 citations74
US4814838AMar 21, 1989
Semiconductor device and method of manufacturing the same
HITACHI LTD11 citations74
US4720836AJan 19, 1988
Distributed feedback semiconductor laser
HITACHI LTD12 citations74
US4406518ASep 27, 1983
Single-mode-transmission optical fiber and a method of manufacturing the same
HITACHI LTD18 citations74
US4905057AFeb 27, 1990
Semiconductor devices
HITACHI LTD10 citations73
US4832430AMay 23, 1989
Optical switch
HITACHI LTD16 citations73
US4933728AJun 12, 1990
Semiconductor optical device
HITACHI LTD13 citations72
US4847573AJul 11, 1989
Optical modulator
HITACHI LTD13 citations72
US4838633AJun 13, 1989
Semiconductor device with high speed signal transmission arrangement utilizing light
HITACHI LTD5 citations63
US4570064AFeb 11, 1986
Optical D.C. electric-field measuring apparatus with optic sensing means exhibiting both electrooptic and photoelectric effects
HITACHI LTD6 citations63
US4483617ANov 20, 1984
Optical gyroscope with large propagation constant difference
HITACHI LTD4 citations63
US4841536AJun 20, 1989
Semiconductor laser devices
HITACHI LTD6 citations60
TOYO GLASS CO LTD
4 patentsUS7346237B2Mar 18, 2008
Optical fiber coupling part
TOYO GLASS CO LTD40 citations92
US7603008B2Oct 13, 2009
Optical fiber coupling part and manufacturing method thereof
TOYO GLASS CO LTD29 citations91
US7357005B2Apr 15, 2008
Fiber optic collimator system, fiber optic collimator array, and manufacturing method of the fiber optic collimator system and fiber optic collimator array system
TOYO GLASS CO LTD34 citations91
US7921672B2Apr 12, 2011
Method for manufacturing GRIN lens
TOYO GLASS CO LTD1 citations51