Inventor
UMEZAKI HIROSHI
JP36 patents
⚠️ This page may combine multiple inventors who share the name “UMEZAKI HIROSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SUMITOMO CHEMICAL CO
14 patentsUS5114437AMay 19, 1992
Polishing composition for metallic material
SUMITOMO CHEMICAL CO51 citations96
US5382556AJan 17, 1995
Translucent polycrystalline alumina and process for producing the same
SUMITOMO CHEMICAL CO23 citations91
US4584243AApr 22, 1986
Abrasive, production thereof and use thereof in magnetic recording medium
SUMITOMO CHEMICAL CO18 citations82
US4740423AApr 26, 1988
Abrasive, production thereof and use thereof in magnetic recording medium
SUMITOMO CHEMICAL CO9 citations74
US4671993AJun 9, 1987
Magnetic recording medium
SUMITOMO CHEMICAL CO14 citations74
US4650895AMar 17, 1987
Process for producing high purity metallic compound
SUMITOMO CHEMICAL CO10 citations73
US4704266ANov 3, 1987
Method for producing lithium aluminate powders
SUMITOMO CHEMICAL CO16 citations72
US5575964ANov 19, 1996
Method for producing silica-alumina fiber
SUMITOMO CHEMICAL CO8 citations71
US5348920ASep 20, 1994
θ-alumina powder, preparation thereof and magnetic recording medium
SUMITOMO CHEMICAL CO8 citations71
US5141807AAug 25, 1992
Magnetic recording medium
SUMITOMO CHEMICAL CO3 citations63
US4498931AFeb 12, 1985
Pigmented aluminum oxide powder and method of producing the same
SUMITOMO CHEMICAL CO5 citations63
US5616410AApr 1, 1997
Magnetic recording medium
SUMITOMO CHEMICAL CO3 citations60
US3954958AMay 4, 1976
Preparation of aluminum hydrate
SUMITOMO CHEMICAL CO5 citations55
US5472468ADec 5, 1995
Exhaust gas filter element
SUMITOMO CHEMICAL CO1 citations45
HITACHI LTD
11 patentsUS4415262ANov 15, 1983
Photomask
HITACHI LTD28 citations92
US4288283ASep 8, 1981
Method of forming a microscopic pattern
HITACHI LTD27 citations81
US4502916AMar 5, 1985
Process for forming fine patterns
HITACHI LTD19 citations79
US4460412AJul 17, 1984
Method of making magnetic bubble memory device by implanting hydrogen ions and annealing
HITACHI LTD14 citations74
US4556582ADec 3, 1985
Method of fabricating magnetic bubble memory device
HITACHI LTD5 citations63
US4503517AMar 5, 1985
Magnetic bubble memory device
HITACHI LTD3 citations62
US4344153AAug 10, 1982
Magnetic bubble memory device and method of fabricating the same
HITACHI LTD5 citations62
US4262054AApr 14, 1981
Magnetic bubble memory device
HITACHI LTD3 citations61
US4772505ASep 20, 1988
Magnetic bubble memory element
HITACHI LTD1 citations52
US4578775AMar 25, 1986
Magnetic bubble memory device
HITACHI LTD1 citations52
US4755430AJul 5, 1988
Magnetic bubble memory device
HITACHI LTD0 citations42
IBM
8 patentsUS6826076B2Nov 30, 2004
Non-volatile memory device
IBM41 citations96
US7123498B2Oct 17, 2006
Non-volatile memory device
IBM30 citations92
US6639834B2Oct 28, 2003
Data register and access method thereof
IBM19 citations92
US6785154B2Aug 31, 2004
MRAM and access method thereof
IBM14 citations84
US7349235B2Mar 25, 2008
Non-volatile memory device
IBM8 citations73
US6992924B2Jan 31, 2006
Magnetic memory and method for optimizing write current in a magnetic memory
IBM10 citations73
US5757592AMay 26, 1998
Laminated coil for a magnetic head of a disk drive and method for manufacturing the same
IBM12 citations73
US7511981B2Mar 31, 2009
Non-volatile memory device
IBM2 citations62