Inventor · disambiguated record
Noriyuki Kumasaka
Also filed as: KUMASAKA NORIYUKI
59 granted patents·8 pending applications·955 citations·filing 1979–2010
99Inventor score
Files withHITACHI LTD51NIPPON MICRO COATING KK8NIHON MICROCOATING CO LTD4HORIMOTO SANAKI2HITACHI MAXELL1
Top patents by PatentIndex Score
67 records- 0193US5147732ALongitudinal magnetic recording media and magnetic memory unitsHITACHI LTD·Filed 1989·Granted Sep 15, 1992·96 cites·34 claims
- 0292US6477133B1Disk drive with unbalance correcting mechanismHITACHI LTD·Filed 2000·Granted Nov 5, 2002·41 cites·7 claims
- 0392US4814921AMultilayered magnetic films and thin-film magnetic heads using the same as a poleHITACHI LTD·Filed 1988·Granted Mar 21, 1989·61 cites·18 claims
- 0491US7374473B2Texturing slurry and texturing method by using sameNIPPON MICRO COATING KK·Filed 2006·Granted May 20, 2008·20 cites·6 claims
- 0589US4935311AMagnetic multilayered film and magnetic head using the sameHITACHI LTD·Filed 1988·Granted Jun 19, 1990·36 cites·15 claims
- 0688US4772976AProcess for preparing magnetic layer and magnetic head prepared using the sameHITACHI LTD·Filed 1985·Granted Sep 20, 1988·31 cites·8 claims
- 0788US4748089AMultilayered ferromagnetic amorphous alloy film and magnetic head employing the sameHITACHI LTD·Filed 1984·Granted May 31, 1988·30 cites·17 claims
- 0888US4559572AMagnetic head and method of fabricating sameHITACHI LTD·Filed 1984·Granted Dec 17, 1985·29 cites·6 claims
- 0988US4539616AThin film magnetic head and fabricating method thereofHITACHI LTD·Filed 1982·Granted Sep 3, 1985·31 cites·13 claims
- 1086US4610935AMagnetic film structureHITACHI LTD·Filed 1984·Granted Sep 9, 1986·41 cites·24 claims
- 1184US6339676B1Video signal recording and reproducing apparatus compatible with analog and digital video signal recording and reproducingHITACHI LTD·Filed 2000·Granted Jan 15, 2002·20 cites·9 claims
- 1282US7585341B2Polishing material comprising diamond clustersNIPPON MICRO COATING KK·Filed 2007·Granted Sep 8, 2009·4 cites·3 claims
- 1382US4316228AMagnetic headHITACHI LTD·Filed 1979·Granted Feb 16, 1982·22 cites·7 claims
- 1477US6503858B1Glass composition, structure, and apparatus using the sameHITACHI LTD·Filed 2000·Granted Jan 7, 2003·10 cites·7 claims
- 1577US4656547AComposite type magnetic head for recording and reproducing high frequency signalsHITACHI LTD·Filed 1984·Granted Apr 7, 1987·19 cites·13 claims
- 1676US4858049AMagnetic film and magnetic head using the sameHITACHI LTD·Filed 1987·Granted Aug 15, 1989·19 cites·28 claims
- 1775US5463518AMagnetic head and magnetic recording and reproducing apparatus using a superconducting quantum interference deviceHITACHI LTD·Filed 1991·Granted Oct 31, 1995·24 cites·30 claims
- 1873US7811972B2Method of polishing tape-shaped substrate and substrate for oxide superconductorNIPPON MICRO COATING KK·Filed 2008·Granted Oct 12, 2010·5 cites·10 claims
- 1973US4774616AMagnetic head having an integrated recording and playback head and an erasure headHITACHI LTD·Filed 1984·Granted Sep 27, 1988·17 cites·4 claims
- 2073US4411716AAmorphous alloys for magnetic head core and video magnetic head using sameHITACHI LTD·Filed 1981·Granted Oct 25, 1983·16 cites·15 claims
- 2172US6369981B2Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unitHITACHI LTD·Filed 2001·Granted Apr 9, 2002·13 cites·14 claims
- 2272US4439794AMagnetic headHITACHI LTD·Filed 1981·Granted Mar 27, 1984·16 cites·11 claims
- 2370US4920013AMagnetic Multilayer structureHITACHI LTD·Filed 1987·Granted Apr 24, 1990·18 cites·9 claims
- 2469US6512655B1Magnetic head with sealing glass compositionHITACHI LTD·Filed 2000·Granted Jan 28, 2003·6 cites·11 claims
- 2569US5157569AThin film magnetic headHITACHI LTD·Filed 1991·Granted Oct 20, 1992·24 cites·2 claims
- 2669US4731683AMagnetic recording and reproducing system with composite magnetic headHITACHI LTD·Filed 1985·Granted Mar 15, 1988·16 cites·4 claims
- 2768US4935314AFerromagnetic film and magnetic head using the sameHITACHI LTD·Filed 1988·Granted Jun 19, 1990·22 cites·7 claims
- 2867US4803338AMagnetic head having improved track width narrowing groovesHITACHI LTD·Filed 1987·Granted Feb 7, 1989·14 cites·19 claims
- 2962US6243230B1Disk drive unit with hydrodynamic fluid bearing unit and disk device with said drive unitHITACHI LTD·Filed 1999·Granted Jun 5, 2001·19 cites·4 claims
- 3062US4450494AMagnetic headHITACHI LTD·Filed 1981·Granted May 22, 1984·11 cites·28 claims
- 3161US8148301B2Method for polishing tape-shaped substrate for oxide superconductor, oxide superconductor, and base material for oxide superconductorHORIMOTO SANAKI·Filed 2007·Granted Apr 3, 2012·3 cites·14 claims
- 3261US4894098AProcess for preparing magnetic layer and magnetic head prepared using the sameHITACHI LTD·Filed 1988·Granted Jan 16, 1990·9 cites·18 claims
- 3361US4769729AMagnetic head having ferromagnetic amorphous alloy multi-layered filmHITACHI LTD·Filed 1986·Granted Sep 6, 1988·11 cites·5 claims
- 3460US6150027AGlass composition, structure, and apparatus using the sameHITACHI LTD·Filed 1996·Granted Nov 21, 2000·14 cites·26 claims
- 3560US4943879AThin film magnetic head including magnetic layers having high saturation magnetic flux density and metal film for avoiding deterioration during manufacturingHITACHI LTD·Filed 1987·Granted Jul 24, 1990·11 cites·17 claims
- 3660US4762755AFerromagnetic material and a magnetic head using the same materialHITACHI LTD·Filed 1984·Granted Aug 9, 1988·14 cites·25 claims
- 3758US8348721B2Method of producing glass substrate for perpendicular magnetic recording diskNIPPON MICRO COATING KK·Filed 2009·Granted Jan 8, 2013·0 cites·4 claims
- 3858US8049990B2Cleaning tape and method of producing sameNIPPON MICRO COATING KK·Filed 2008·Granted Nov 1, 2011·0 cites·8 claims
- 3958US7857876B2Method of producing polishing material comprising diamond clustersNIPPON MICRO COATING KK·Filed 2009·Granted Dec 28, 2010·0 cites·8 claims
- 4058US6256288B1Disk apparatus and motor thereforHITACHI LTD·Filed 1998·Granted Jul 3, 2001·13 cites·11 claims
- 4156US8143194B2Method for polishing tape-shaped substrate for oxide superconductor, oxide superconductor, and base material for oxide superconductorHORIMOTO SANAKI·Filed 2007·Granted Mar 27, 2012·2 cites·9 claims
- 4256US4972285AAmorphous magnetic alloy of Co-Nb-Zr system and magnetic head made from the sameHITACHI LTD·Filed 1988·Granted Nov 20, 1990·11 cites·8 claims
- 4356US4766039AMagnetic head made from amorphous magnetic filmHITACHI LTD·Filed 1986·Granted Aug 23, 1988·9 cites·19 claims
- 4455US4600488AControl method of magnetic anisotropy and device utilizing the control methodHITACHI LTD·Filed 1985·Granted Jul 15, 1986·9 cites·36 claims
- 4554US4847715AMagnetic head having short distance between gaps for recording reproducing and erasingHITACHI LTD·Filed 1986·Granted Jul 11, 1989·9 cites·9 claims
- 4653US4891278AFerrromagnetic thin film and magnetic head using itHITACHI LTD·Filed 1987·Granted Jan 2, 1990·15 cites·25 claims
- 4752US6104862AVideo signal recording and reproducing apparatus compatible with analog and digital video signal recording and reproducingHITACHI LTD·Filed 1995·Granted Aug 15, 2000·13 cites·41 claims
- 4852US5290738AMaterial for nonmagnetic oxide substrate and magnetic headHITACHI METALS LTD·Filed 1991·Granted Mar 1, 1994·8 cites·3 claims
- 4949US6033792ASoft magnetic thin film, and magnetic head and magnetic recording device using the sameHITACHI LTD·Filed 1998·Granted Mar 7, 2000·8 cites·13 claims
- 5049US4745507AComposite type magnetic head with non-magnetic member in coil mounting portionHITACHI LTD·Filed 1986·Granted May 17, 1988·7 cites·18 claims
Showing the top 50 of 67 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →