Inventor

Takehiko Umeyama

Inventor

Tokyo, JP

Overview

35→

Patents

1992–2016

Patent span

Electricity

Primary field (CPC H)

Patents· 35 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 transducer27%

H03FAmplifiers16%

H03KPulse technique15%

G01RMeasuring electric variables7%

H01SDevices using the process of light amplification by stimulated emission of radiation [laser] to amplify or generate light7%

H10DInorganic electric semiconductor devices4%

B82YSpecific uses or applications of nanostructures2%

G01KMeasuring temperature2%

G05FSystems for regulating electric or magnetic variables2%

G06FElectric digital data processing2%

PatentTitleYear

9,252,750'Semiconductor integrated circuit and operating method thereof'2016 8,786,162'Device for driving a piezoelectric element'2014 8,344,654'Driving circuit for and semiconductor device for driving laser diode'2013 8,098,023'Driving circuit for and semiconductor device for driving laser diode'2012 8,064,300'Optical disk apparatus, signal processing semiconductor integrated circuit constituting the same, and operation method'2011 7,791,288'Driving circuit for and semiconductor device for driving laser diode'2010 7,643,261'Semiconductor device'2010 7,372,882'Driving circuit for and semiconductor device for driving laser diode'2008 7,187,513'Differential magneto-resistive head pre-amplifiers for single polarity power supply applications'2007 6,998,733'Pulse current generation circuit'2006 6,783,274'Device for measuring temperature of semiconductor integrated circuit'2004 6,731,449'Magnetic recording writing circuit'2004 6,683,487'Current driver circuit for supplying write current to a write head while changing a flow direction of the write current'2004 6,339,567'Method of and apparatus for optical information reproduction'2002 6,320,830'Optical information reproduction device and signal processing circuit used therein'2001 6,252,457'Differential amplifier circuit'2001 6,222,415'Magneto-resistive element signal amplifying circuit'2001 6,211,736'Signal amplifying circuit for magnetoresistive element'2001 6,208,482'Signal amplifying circuit for an MR element'2001 6,201,421'Write current driving circuit'2001 5,986,840'Amplifier with capacitive feedback for driving a magneto-resistive head'1999 5,852,521'Amplifier circuit suppressing disturbance signal produced by magnetoresistive head'1998 5,834,969'Circuit for processing signals from a magneto-resistive head'1998 5,812,011'Current switching circuit formed in an integrated semiconductor circuit'1998 5,694,083'Single end input high frequency amplifier'1997 5,568,103'Current control circuit of ring oscillator'1996 5,557,220'Polarity detector'1996 5,453,718'Differential amplifier for reducing input capacitance without deterorating noise characteristics'1995 5,311,141'Active filter circuit'1994 5,302,892'Semiconductor integrated circuit'1994 5,300,825'Peak signal detecting device'1994 5,270,883'Magnetic read/write circuit'1993 5,266,826'Semiconductor integrated circuit'1993 5,155,429'Threshold voltage generating circuit'1992 5,134,313'Peak hold circuit'1992

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1992–2004Patents assigned to MITSUBISHI ELECTRIC CORP (23)· patent assignee history

1992–1996Based in Itami, JP· patent location history

1994–2004Patents assigned to MITSUBISHI ELECTRIC ENG (4)· patent assignee history

1994–1996Based in Hyogo, JP· patent location history

1997–2013Based in Tokyo, JP· patent location history

2004–2010Patents assigned to RENESAS TECH CORP (6)· patent assignee history

2011–2016Patents assigned to RENESAS ELECTRONICS CORP (5)· patent assignee history

2011–2014Patents assigned to UMEYAMA TAKEHIKO (4)· patent assignee history

2014Based in Kanagawa, JP· patent location history

2016Based in Kawasaki, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
MITSUBISHI ELECTRIC CORP	23	1992–2004
RENESAS TECH CORP	6	2004–2010
RENESAS ELECTRONICS CORP	5	2011–2016
MITSUBISHI ELECTRIC ENG	4	1994–2004
UMEYAMA TAKEHIKOself	4	2011–2014

Locations

Location	Patents	Span
Tokyo, JP	23	1997–2013
Itami, JP	7	1992–1996
Hyogo, JP	2	1994–1996
Kawasaki, JP	1	2016
Kanagawa, JP	1	2014