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Inventor

Toshiko Koizumi

Inventor
Kokubunji, JP

Overview

2→
Patents
1990–1991
Patent span
Electricity
Primary field (CPC H)

Patents· 2 as inventor

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

G11Cprimary
G11CStatic stores40%
H10DInorganic electric semiconductor devices40%
H10BElectronic memory devices20%
PatentTitleYear
4,996,571'Non-volatile semiconductor memory device erasing operation'19914,972,371'Semiconductor memory device'1990

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1990–1991Patents assigned to HITACHI LTD (2)· patent assignee history
1990–1991Based in Kokubunji, JP· patent location history
1991Patents assigned to HITACHI DEVICE ENG (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI LTD21990–1991
HITACHI DEVICE ENG11991
Locations
LocationPatentsSpan
Kokubunji, JP21990–1991