Inventor

Tsuneo Suganuma

Inventor

Tokorozawa, JP

Overview

22→

Patents

1980–1996

Patent span

Chemistry

Primary field (CPC C)

Patents· 22 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

C03Bprimary

C03BManufacture, shaping, or supplementary processes23%

C03CChemical composition of glasses, glazes or vitreous enamels15%

G02BOptical elements, systems or apparatus15%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests15%

G11BInformation storage based on relative movement between record carrier and transducer8%

G01RMeasuring electric variables6%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein4%

Y10TTechnical subjects covered by former us classification4%

C01BNon-metallic elements2%

G01CMeasuring distances, levels or bearings2%

PatentTitleYear

5,587,235'Magnetic recording medium and magnetic recording apparatus'1996 5,270,987'Magneto-optical recording and reproducing method, magneto-optical memory apparatus and magneto-optical recording medium therefor'1993 5,034,243'Method for magnetic orientation of magnetic recording medium using Meissner effect of high Tc superconductor'1991 4,828,592'Polarization plane maintaining optical fiber fabricating method'1989 4,786,553'Magnetic recording medium'1988 4,604,577'Temperature-compensated magnetic field measuring instrument'1986 4,581,579'Optical magnetic-field measuring apparatus having improved temperature characteristics'1986 4,570,064'Optical D.C. electric-field measuring apparatus with optic sensing means exhibiting both electrooptic and photoelectric effects'1986 4,505,729'Method of producing optical fiber preform'1985 4,483,617'Optical gyroscope with large propagation constant difference'1984 4,426,129'Optical fiber and method of producing the same'1984 4,426,216'Process for producing optical glass'1984 4,406,518'Single-mode-transmission optical fiber and a method of manufacturing the same'1983 4,390,460'Lithium oxide based amorphous material and process for preparation thereof'1983 4,324,576'Method for producing optical glass'1982 4,323,381'Method for producing mother rods for optical fibers'1982 4,317,668'Method for producing silica glass'1982 4,259,101'Method for producing optical fiber preform'1981 4,206,967'Optical fiber'1980 4,206,968'Optical fiber and method for producing the same'1980 4,203,743'Method of producing optical fiber'1980 4,185,890'Optical transmission line'1980

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1980–1996Patents assigned to HITACHI LTD (22)· patent assignee history

1980–1986Patents assigned to HITACHI CABLE (3)· patent assignee history

1980–1996Based in Tokorozawa, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI LTD	22	1980–1996
HITACHI CABLE	3	1980–1986

Locations

Location	Patents	Span
Tokorozawa, JP	22	1980–1996