P

Inventor

KOYAMA ARATA

JP5 patents
⚠️ This page may combine multiple inventors who share the name “KOYAMA ARATA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

ISHIHARA MINING & CHEMICAL CO

3 patents
US4414245ANov 8, 1983

Process for producing cobalt containing ferromagnetic iron oxides

ISHIHARA MINING & CHEMICAL CO9 citations70
US4486467ADec 4, 1984

Process for producing cobalt-containing magnetic iron oxide powder

ISHIHARA MINING & CHEMICAL CO3 citations59
US5041307AAug 20, 1991

Process for producing magnetic iron oxide particles for magnetic recording

ISHIHARA MINING & CHEMICAL CO3 citations58

ISHIHARA SANGYO KAISHA

2 patents
US5609789AMar 11, 1997

Cobalt-containing magnetic iron oxide and process for producing the same

ISHIHARA SANGYO KAISHA4 citations59
US4551327ANov 5, 1985

Process for producing cobalt-and ferrous iron-containing ferromagnetic iron oxides

ISHIHARA SANGYO KAISHA4 citations59