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Inventor

Ken Yoshizawa

Inventor
Tochigi, JP

Overview

7→
Patents
1987–2008
Patent span
General tagging of new technological developments
Primary field (CPC Y)

Patents· 7 as inventor

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

G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer33%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests27%
Y10TTechnical subjects covered by former us classification20%
C30BSingle-crystal growth13%
H05BElectric heating7%
PatentTitleYear
7,361,219'Method for producing silicon wafer and silicon wafer'20085,993,948'Magnetic recording medium'19995,792,258'High-frequency induction heater and method of producing semiconductor single crystal using the same'19985,776,590'Magnetic recording medium'19985,273,598'Optical disc manufacturing method'19934,911,968'Optical disc'19904,710,913'Optical recording disc'1987

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1987–1993Patents assigned to HITACHI MAXELL (3)· patent assignee history
1990Based in Ibaraki, JP· patent location history
1993Based in Tsukuba, JP· patent location history
1998–1999Patents assigned to KAO CORP (2)· patent assignee history
1998–2008Patents assigned to SHINETSU HANDOTAI KK (2)· patent assignee history
1998–1999Based in Tochigi, JP· patent location history
1998Based in Annaka, JP· patent location history
2008Based in Niigata, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI MAXELL31987–1993
KAO CORP21998–1999
SHINETSU HANDOTAI KK21998–2008
Locations
LocationPatentsSpan
Tochigi, JP21998–1999
Niigata, JP12008
Annaka, JP11998
Tsukuba, JP11993
Ibaraki, JP11990