Inventor

Masafumi Yoshihiro

Inventor

Ibaraki, JP

Overview

1994–2004

Patent span

Physics

Primary field (CPC G)

Patents· 23 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 transducer66%

B82YSpecific uses or applications of nanostructures11%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests11%

Y10TTechnical subjects covered by former us classification11%

PatentTitleYear

6,693,854'Reproducing method and reproducing apparatus for magneto-optical recording medium'2004 6,584,044'Magneto-optical recording apparatus using multiple magnetic field strengths for recording different mark lengths'2003 6,567,348'Method for recording mark length shorter than channel bit length on magneto-optical medium'2003 6,556,516'Reproducing method and reproducing apparatus for magneto-optical recording medium using different radiation patterns'2003 6,477,118'METHOD AND APPARATUS FOR RECORDING AND REPRODUCING INFORMATION BY APPLYING FIELD IN A DIRECTION OTHER THAN THE DIRECTION OF MAGNETIZATION OR THE DIRECTION TO A SURFACE OF AN INFORMATION RECORDING MEDIUM'2002 6,434,088'Recording and reproducing apparatus having a magneto-optical head with an objective lens and laser-beam-permeable member'2002 6,424,601'Magneto-optical recording media having an auxiliary magnetic layer'2002 6,388,954'Magneto-optical recording medium having clock-marks on recording layer and apparatus for recording and reproducing same'2002 6,385,141'Magneto-optical recording method capable of adjusting the sizes magnetic domain'2002 6,385,140'Magneto-optical recording medium and reproducing method for reproducing magnetic domain in enlarged form on a reproducing layer'2002 6,366,541'Optical recording medium with solid protective layer having self-lubricating property'2002 6,246,640'Magneto-optical recording medium capable of recording multiple value signals'2001 6,226,234'Magneto-optic recording medium and reproducing method for reproducing magnetic domain in enlarged form on a reproducing layer'2001 6,160,769'Optical recording medium and optical recording device'2000 6,101,153'Magnetic head capable of generating multi-stepped external magnetic fields for magneto-optical recording device'2000 6,061,307'Magneto-optical recording medium having a plurality of magnetic layers'2000 6,044,041'Recording and reproducing apparatus having a magneto-optical head with an objective lens and laser-beam-permeable member'2000 5,965,286'Magneto-optical recording medium'1999 5,783,320'Magneto-optical recording medium and process for producing the same'1998 5,639,563'Magneto-optical recording medium'1997 5,637,411'Magneto-optical recording medium and process for producing the same'1997 5,590,097'Magnetooptic recording medium'1996 5,315,577'Optical recording/reproducing by changing perpendicular magnetic anisotropy to non-perpendicular magnetic anisotropy'1994

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1994–2004Patents assigned to HITACHI MAXELL (23)· patent assignee history

1994–2003Patents assigned to HITACHI LTD (2)· patent assignee history

1994Based in Yuuki, JP· patent location history

1996–2004Based in Nishikamo-gun, JP· patent location history

1997–2002Based in Ibaraki, JP· patent location history

2000Based in Kitasoma-gun, JP· patent location history

2002Patents assigned to SANYO ELECTRIC CO (1)· patent assignee history

2002Based in Ibararaki, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI MAXELL	23	1994–2004
HITACHI LTD	2	1994–2003
SANYO ELECTRIC CO	1	2002

Locations

Location	Patents	Span
Ibaraki, JP	10	1997–2002
Nishikamo-gun, JP	9	1996–2004
Kitasoma-gun, JP	2	2000
Ibararaki, JP	1	2002
Yuuki, JP	1	1994