Inventor

Klaas B. Klaassen

Inventor

San Jose, CA, US

Overview

43→

Patents

1983–2012

Patent span

Physics

Primary field (CPC G)

Patents· 43 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 transducer56%

G01RMeasuring electric variables12%

G06FElectric digital data processing5%

H03FAmplifiers5%

H05KPrinted circuits5%

Y02DClimate change mitigation technologies in information and communication technologies [ict], i.e. information and communication technologies aiming at the reduction of their own energy use5%

B82YSpecific uses or applications of nanostructures4%

H03KPulse technique3%

Y10TTechnical subjects covered by former us classification3%

G11CStatic stores1%

PatentTitleYear

8,174,788'Motor mount for interference suppression in a hard disk drive'2012 8,059,373'EMR sensor and transistor formed on the same substrate'2011 7,667,914'Direct coupled wide-bandwidth front-end with smart bias control amplifier'2010 7,619,843'Write through drivers for disk drive systems'2009 7,545,608'Current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with impedance adjustment'2009 7,489,479'Electrical lead suspension having partitioned air slots'2009 7,352,535'Method and apparatus for reducing crosstalk and signal loss in flexing interconnects of an electrical lead suspension'2008 7,177,107'Preamplifier circuit with signal interference cancellation suitable for use in magnetic storage devices'2007 7,158,348'Integrated lead suspension for use in a disk drive using a tri-metal laminate and method for fabrication'2007 7,061,706'Circuitry for linear control of head flying height using thermal means'2006 6,859,347'Magnetic transducer with electrically conductive shield for reducing electromagnetic interference'2005 6,671,113'Characteristically terminated write driver with compensation for magnetic response and method therefor'2003 6,622,252'Data storage device having selectable performance modes for use in dual powered portable devices'2003 6,608,736'Integrated trace suspension interconnect for high-data-rate single-ended preamplifier for (G)MR elements'2003 6,420,910'Quasi-current sensing input impedance controlled preamplifier for magnetoresistive elements'2002 6,400,518'Magneto-resistive asymmetry correction circuit'2002 6,201,653'By-pass write drivers for high-performance data recording'2001 6,101,056'Electronic magnetoresistive voltage biasing using a circuit and current mirrors'2000 5,986,839'Electronic magnetoresistive sensor biasing using a transducer equivalent circuit and current sources'1999 5,969,523'Preamplifier bias mode to re-initialize a GMR head after losing initialization'1999 5,953,173'High CMRR and sensor-disk short-circuit protection device for dual element magnetoresistive heads'1999 5,877,911'Magneto-resistive head pre-amplifying circuit for avoiding output voltage transients'1999 5,818,656'Circuitry for correction of thermal transients in the analog signal from a magnetoresistive sensor'1998 5,608,591'Integrated head-electronics interconnection suspension for a data recording disk drive'1997 5,544,138'Adaptive system for optimizing disk drive power consumption'1996 5,521,896'Adaptive system for optimizing disk drive power consumption'1996 5,452,277'Adaptive system for optimizing disk drive power consumption'1995 5,323,278'Low noise amplifier circuit for magnetoresistive sensors for fast read-write switching in low supply voltage applications'1994 5,270,882'Low-voltage, low-power amplifier for magnetoresistive sensor'1993 5,168,395'Controlled magnetic recording head relaxation in a magnetic recording system'1992 5,130,866'Method and circuitry for in-situ measurement of transducer/recording medium clearance and transducer magnetic instability'1992 5,103,353'Low noise amplifier with short circuit protection for signals from magnetoresistive element'1992 5,057,785'Method and circuitry to suppress additive disturbances in data channels'1991 5,032,935'Amplification of signals produced by a magnetoresistive element'1991 4,914,398'Method and circuitry to suppress additive disturbances in data channels containing MR sensors'1990 4,879,610'Protective circuit for a magnetoresistive element'1989 4,786,993'Voltage amplifier for constant voltage biasing and amplifying signals from a MR sensor'1988 4,777,544'Method and apparatus for in-situ measurement of head/recording medium clearance'1988 4,743,861'Frequency response compensation circuit'1988 4,712,144'Method and apparatus for reading recorded data by a magnetoresistive head'1987 4,706,138'Amplification of signals produced by a magnetic sensor'1987 4,547,817'High frequency magnetic recording method'1985 4,390,911'Signal separation in magnetic recording using buried servo'1983

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1983–2003Patents assigned to IBM (32)· patent assignee history

1983–1985Based in 's-Gravenzande, NL· patent location history

1987–2012Based in San Jose, CA, US· patent location history

2005–2010Patents assigned to HITACHI GLOBAL STORAGE TECH (9)· patent assignee history

2011–2012Patents assigned to HITACHI GLOBAL STORAGE TECH NL (2)· patent assignee history

2011–2012Patents assigned to KLAASSEN KLAAS B (2)· patent assignee history

2012Patents assigned to CONTRERAS JOHN (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
IBM	32	1983–2003
HITACHI GLOBAL STORAGE TECH	9	2005–2010
HITACHI GLOBAL STORAGE TECH NL	2	2011–2012
KLAASSEN KLAAS Bself	2	2011–2012
CONTRERAS JOHN	1	2012

Locations

Location	Patents	Span
San Jose, California, US	41	1987–2012
's-Gravenzande, NL	2	1983–1985