Inventor

KUMAGAI YOSHIHIRO

JP21 patents

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

KUMAGAI YOSHIHIRO

KURARAY CO

Rear projection screen incorporating a prism

Optical device and Fresnel lens sheet

Lenticular lens sheet

Rear-projection screen

Rear projection screen and rear projection display apparatus

Rear projection screen with shifted lens

NIPPON MITSUBISHI OIL CORP

Complex diffraction device

Optical film

NIPPON OIL CORP

Circular polarizer and liquid crystal display

Liquid crystal cell with twist angle from 180 to 270 degrees and twisted optical compensating element

YOKOGAWA ELECTRIC CORP

Optical fiber characteristics measurement apparatus and optical fiber characteristics measurement method

Optical fiber characteristic measurement device, optical fiber characteristic measurement program, and optical fiber characteristic measurement method for measuring characteristics of optical fiber based on Brillouin gain spectrum

ANDO ELECTRIC

Optical pulse generator

Optical pulse generator

CENTRAL GLASS CO LTD

Laminated transparent structure for reflective display

TSUBAKIMOTO CHAIN CO

Tensioner or toothed belts

SANWA KAGAKU KENKYUSHO CO

Novel 2-oxopyrrolidine compounds, salts thereof process for the preparation thereof as well as pharmaceutical agent comprising the compound

HOTATE KAZUO

Optical fiber characteristic measuring device and method

JX NIPPON OIL & ENERGY CORP

Method for producing concave-convex substrate using sol-gel method, sol used in same, method for producing organic EL element using same, and organic EL element obtained thereby

NIPPON OIL CO LTD

Liquid crystalline polyesters

KISHI MASATO

Optical fiber characteristics measurement device and method