Inventor

SUGANUMA TSUNEO

JP22 patents

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

SUGANUMA TSUNEO

HITACHI LTD

Optical fiber and method of producing the same

Method for producing silica glass

Magneto-optical recording and reproducing method, magneto-optical memory apparatus and magneto-optical recording medium therefor

Magnetic recording medium and magnetic recording apparatus

Temperature-compensated magnetic field measuring instrument

Optical magnetic-field measuring apparatus having improved temperature characteristics

Process for producing optical glass

Method for producing mother rods for optical fibers

Optical transmission line

Method of producing optical fiber preform

Method for producing optical glass

Polarization plane maintaining optical fiber fabricating method

Single-mode-transmission optical fiber and a method of manufacturing the same

Magnetic recording medium

Lithium oxide based amorphous material and process for preparation thereof

Method for producing optical fiber preform

Optical fiber and method for producing the same

Method of producing optical fiber

Method for magnetic orientation of magnetic recording medium using Meissner effect of high Tc superconductor

Optical D.C. electric-field measuring apparatus with optic sensing means exhibiting both electrooptic and photoelectric effects

Optical gyroscope with large propagation constant difference

HITACHI CABLE

Optical fiber