Inventor

OKA KEIKO

JP10 patents

⚠️ This page may combine multiple inventors who share the name “OKA KEIKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

HITACHI HIGH TECH CORP

2 patents

US10830706B2Nov 10, 2020

Defect inspection apparatus and defect inspection method

HITACHI HIGH TECH CORP2 citations73

US11143598B2Oct 12, 2021

Defect inspection apparatus and defect inspection method

HITACHI HIGH TECH CORP0 citations62

KURARAY CO

1 patent

US6139963AOct 31, 2000

Polyvinyl alcohol hydrogel and process for producing the same

KURARAY CO87 citations97

BIOSENSOR RESEARCH LAB CO LTD

1 patent

US5556760ASep 17, 1996

Method for assaying urease

BIOSENSOR RESEARCH LAB CO LTD62 citations89

BIO SENSOR KENKYUSHO KK

1 patent

US5674696AOct 7, 1997

Apparatus for the determination of a trace amount of an analyte substance or organism

BIO SENSOR KENKYUSHO KK7 citations70

HITACHI LTD

1 patent

US11378521B2Jul 5, 2022

Optical condition determination system and optical condition determination method

HITACHI LTD1 citations61

RIKEN

1 patent

US6927914B2Aug 9, 2005

Grism

RIKEN4 citations56

HITACHI GLOBAL LIFE SOLUTIONS INC

1 patent

US12385679B2Aug 12, 2025

Refrigerant quantity diagnosis device, refrigerant system, and refrigerant quantity diagnosis method

HITACHI GLOBAL LIFE SOLUTIONS INC0 citations47

OKA KEIKO

1 patent

US8730471B2May 20, 2014

DUV-UV band spectroscopic optical system and spectrometer using same

OKA KEIKO1 citations45

YOSHITAKE YASUHIRO

1 patent

US8705024B2Apr 22, 2014

Wavefront aberration measuring method and device therefor

YOSHITAKE YASUHIRO0 citations37