Inventor

Yoshio Igarashi

Inventor

Tochigi, JP

Overview

1987–2020

Patent span

Electricity

Primary field (CPC H)

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

C22Cprimary

C22CAlloys18%

H01TSpark gaps12%

B23KSoldering or unsoldering6%

C21CProcessing of pig-iron, e.g. refining, manufacture of wrought-iron or steel6%

C21DModifying the physical structure of ferrous metals6%

C23CCoating metallic material6%

F01NGas-flow silencers or exhaust apparatus for machines or engines in general6%

G11BInformation storage based on relative movement between record carrier and transducer6%

H01FMagnets6%

H01LSemiconductor devices6%

PatentTitleYear

Assembled from patent assignee/location history and declaration credentials.

1987–2010Patents assigned to HITACHI METALS LTD (4)· patent assignee history

1987–1989Patents assigned to SANKOSHA CO LTD (2)· patent assignee history

1987Based in Kumagaya, JP· patent location history

1989Based in Machida, JP· patent location history

1995Based in Minamikawachi-gun, JP· patent location history

2000–2010Based in Tochigi, JP· patent location history

2020Patents assigned to FUJI ELECTRIC CO LTD (1)· patent assignee history

2020Based in Azumino, JP· patent location history

Assignee and location history derived from the patent record.

Assignees

Locations