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Inventor

Shigeo Hirai

Inventor
Otsu, JP

Overview

3→
Patents
1983–1984
Patent span
Electricity
Primary field (CPC H)

Patents· 3 as inventor

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

H01Fprimary
H01FMagnets50%
B22FWorking metallic powder17%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests17%
Y10TTechnical subjects covered by former us classification17%
PatentTitleYear
4,456,475'Process for preparing ferromagnetic particles comprising metallic iron'19844,400,337'Method for production of metal magnetic particles'19834,390,361'Process for preparing ferromagnetic particles comprising metallic iron'1983

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1983–1984Patents assigned to HITACHI MAXELL (3)· patent assignee history
1983Based in Ohtsu, JP· patent location history
1983Based in Shiga, JP· patent location history
1984Based in Otsu, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI MAXELL31983–1984
Locations
LocationPatentsSpan
Otsu, JP11984
Ohtsu, JP11983
Shiga, JP11983