Inventor
Hideyuki Yamakawa
Inventor
Kawasaki, JP
Overview
Patents· 17 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 transducer63%
H03MCoding21%
H03GControl of amplification4%
H03LAutomatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses4%
H04LTransmission of digital information, e.g. telegraphic communication4%
H10KOrganic electric solid-state devices4%
PatentTitleYear
8,194,518'Optical disc device and optical disc playback method'20127,786,667'Organic electroluminescent element comprising a luminescent assist layer'20107,535,811'Disk device and disk reproduction method that prevents a wrong reproducing operation when a defect on the disk is determined'20097,466,253'Integrated circuit, self-test method for the integrated circuit, and optical disc apparatus including the integrated circuit'20087,403,463'Method and apparatus for filtering read signal to three or more cutoff frequencies with two or more bits control line throughout three or more consecutive periods'20087,397,751'Optical disk apparatus, method of recording information, and information recording medium'20087,379,408'Disk apparatus and method using plural tap coefficient equalization'20087,370,266'Digital signal decoding device and digital signal decoding method'20086,980,385'Apparatus for information recording and reproducing'20056,975,252'Disk apparatus and disk reproducing method'20056,812,868'Run length limited code generation method, run length limited code recording/reproducing apparatus, and run length limited code recording/reproduction method'20046,791,776'Apparatus for information recording and reproducing'20045,940,416'Digital signal decoding apparatus and a decoding method used therein'19995,844,741'System for reproducing high-density magnetic record data with viterbi detector for generating quadripartite reproduction data'19985,625,632'Magnetic disk drive including a data discrimination apparatus capable of correcting signal waveform distortion due to intersymbol interference'19975,553,104'Information recording/reproducing apparatus having a clock timing extraction circuit for extracting a clock signal from an input data signal'19965,448,424'AGC circuit and recording and reproducing apparatus using AGC circuit'1995Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1995–2004Patents assigned to HITACHI LTD (6)· patent assignee history
1995–2005Based in Fujisawa, JP· patent location history
1999Based in San Jose, CA, US· patent location history
2004–2012Patents assigned to TOSHIBA KK (9)· patent assignee history
2004Patents assigned to HITACHI VIDEO & INF SYST (1)· patent assignee history
2004–2009Based in Kawasaki, JP· patent location history
2005Patents assigned to HITACHI GLOBAL STORAGE TECH (1)· patent assignee history
2008–2010Based in Tokyo, JP· patent location history
2010Patents assigned to TOPPAN PRINTING CO LTD (1)· patent assignee history
2012Based in Yokohama, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| TOSHIBA KK | 9 | 2004–2012 |
| HITACHI LTD | 6 | 1995–2004 |
| HITACHI GLOBAL STORAGE TECH | 1 | 2005 |
| HITACHI VIDEO & INF SYST | 1 | 2004 |
| TOPPAN PRINTING CO LTD | 1 | 2010 |
Locations
| Location | Patents | Span |
|---|---|---|
| Kawasaki, JP | 7 | 2004–2009 |
| Fujisawa, JP | 6 | 1995–2005 |
| Tokyo, JP | 2 | 2008–2010 |
| Yokohama, JP | 1 | 2012 |
| San Jose, California, US | 1 | 1999 |