Inventor
UMEKI SHINJI
16 patents
⚠️ This page may combine multiple inventors who share the name “UMEKI SHINJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
TDK ELECTRONICS CO LTD
15 patentsUS4321302AMar 23, 1982
Process for producing magnetic powder having high coercive force
TDK ELECTRONICS CO LTD52 citations93
US4311684AJan 19, 1982
Process for producing iron oxide containing magnetite
TDK ELECTRONICS CO LTD18 citations73
US4010310AMar 1, 1977
Magnetic powder
TDK ELECTRONICS CO LTD10 citations73
US3977985AAug 31, 1976
Magnetic recording medium comprising cobalt or cobalt alloy coated particles of spicular magnetite
TDK ELECTRONICS CO LTD14 citations73
US3953656AApr 27, 1976
Magnetic recording medium and preparation thereof
TDK ELECTRONICS CO LTD10 citations73
US4069367AJan 17, 1978
Magnetic powder material comprising iron oxide particles with a copper-cobalt alloy coating
TDK ELECTRONICS CO LTD16 citations72
US4067755AJan 10, 1978
Method of making powdered magnetic iron oxide material
TDK ELECTRONICS CO LTD12 citations72
US3958068AMay 18, 1976
Process for the production of powdered magnetic material
TDK ELECTRONICS CO LTD13 citations72
US4323464AApr 6, 1982
Process for producing hydrated iron oxide having silicon and phosphorus component
TDK ELECTRONICS CO LTD4 citations62
US4305921ADec 15, 1981
Process for producing iron oxide
TDK ELECTRONICS CO LTD2 citations62
US4255409AMar 10, 1981
Process for producing acicular goethite
TDK ELECTRONICS CO LTD2 citations60
US4251504AFeb 17, 1981
Process for producing acicular goethite
TDK ELECTRONICS CO LTD5 citations60
US4302510ANov 24, 1981
Magnetic recording medium
TDK ELECTRONICS CO LTD4 citations59
US4363831ADec 14, 1982
Process for producing magnetic powder having high coercive force
TDK ELECTRONICS CO LTD1 citations52
US4112184ASep 5, 1978
Magnetic recording medium and method of preparing
TDK ELECTRONICS CO LTD5 citations51