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Inventor

Keiji Moroishi

Inventor
Yamanashi, JP

Overview

11→
Patents
1992–2011
Patent span
Physics
Primary field (CPC G)

Patents· 11 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 transducer45%
Y10TTechnical subjects covered by former us classification25%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests15%
C04BLime, magnesia5%
C23CCoating metallic material5%
H10NElectric solid-state devices not otherwise provided for5%
PatentTitleYear
7,993,497'Magnetic disk and magnetic disk manufacturing method'20116,916,558'Magnetic disk using a glass substrate'20056,759,138'Antiferromagnetically coupled magnetic recording medium with dual-layered upper magnetic layer'20046,287,429'Magnetic recording medium having an improved magnetic characteristic'20015,968,679'Magnetic recording medium and method of manufacturing the same'19995,954,927'Method of manufacturing magnetic recording medium'19995,900,324'Magnetic recording media, methods for producing the same and magnetic recorders'19995,824,427'Magnetic recording media and methods for producing the same'19985,766,727'Magnetic recording medium and method for manufacturing the same'19985,746,893'Method of manufacturing magnetic recording medium'19985,100,869'Process for producing metal oxide-type superconductive material'1992

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1992–2004Patents assigned to HOYA CORP (9)· patent assignee history
1992Patents assigned to MASUMOTO TSUYOSHI (1)· patent assignee history
1992Based in Akishima, JP· patent location history
1998–1999Based in Yamanashi, JP· patent location history
1998Based in Kofu, JP· patent location history
2001Based in Tokyo, JP· patent location history
2004–2005Patents assigned to HOYA MAGNETICS SINGAPORE PTE (2)· patent assignee history
2004–2011Based in Singapore, SG· patent location history
2011Patents assigned to WD MEDIA SINGAPORE PTE LTD (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HOYA CORP91992–2004
HOYA MAGNETICS SINGAPORE PTE22004–2005
MASUMOTO TSUYOSHI11992
WD MEDIA SINGAPORE PTE LTD12011
Locations
LocationPatentsSpan
Yamanashi, JP51998–1999
Singapore, SG32004–2011
Tokyo, JP12001
Kofu, JP11998
Akishima, JP11992