Inventor

Tokuho Takagaki

Inventor

Yokohama, JP

Overview

1990–2007

Patent span

Physics

Primary field (CPC G)

Patents· 14 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 transducer23%

Y10TTechnical subjects covered by former us classification18%

B82YSpecific uses or applications of nanostructures13%

G01RMeasuring electric variables13%

H01FMagnets13%

H10NElectric solid-state devices not otherwise provided for13%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests5%

PatentTitleYear

7,159,303'Method for manufacturing magnetic head device'2007 7,054,120'Magnetic apparatus with perpendicular recording medium and head having multilayered reproducing element using tunneling effect'2006 6,687,099'Magnetic head with conductors formed on endlayers of a multilayer film having magnetic layer coercive force difference'2004 6,483,677'Magnetic disk apparatus including magnetic head having multilayered reproducing element using tunneling effect'2002 6,278,593'Magnetoresistance effect elements and magnetic heads using the tunneling magnetoresistive effect'2001 6,011,674'Magnetoresistance effect multilayer film with ferromagnetic film sublayers of different ferromagnetic material compositions'2000 5,879,569'Magnetic disk and method of and apparatus for manufacturing magnetic disk'1999 5,736,235'Magnetic recording medium having at least two magnetic layers with easy axes oriented in the same direction'1998 5,726,837'Multilayer magnetoresistance effect-type magnetic head'1998 5,587,235'Magnetic recording medium and magnetic recording apparatus'1996 5,568,331'Method of head positioning and magnetic recording disk drive using the same'1996 5,390,061'Multilayer magnetoresistance effect-type magnetic head'1995 5,325,244'Magnetic recording data storage system'1994 4,950,548'Magnetic recording medium and method of producing same'1990

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1990–2004Patents assigned to HITACHI LTD (12)· patent assignee history

1990–2007Based in Yokohama, JP· patent location history

1994Based in Odawara, JP· patent location history

1996–1999Based in Hiratsuka, JP· patent location history

2006–2007Patents assigned to HITACHI GLOBAL STORAGE TECH (2)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HITACHI LTD	12	1990–2004
HITACHI GLOBAL STORAGE TECH	2	2006–2007

Locations

Location	Patents	Span
Yokohama, JP	11	1990–2007
Hiratsuka, JP	2	1996–1999
Odawara, JP	1	1994