Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1987-07-07
1989-10-17
Thibodeau, Paul J.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
428404, 428694, 428900, G11B 570
Patent
active
048746681
ABSTRACT:
Magnetic powder at least a part of particles of which have surface-adjacent layers comprising an aluminium-containing oxide of the corundum structure has high hardness so that a magnetic recording medium comprising a magnetic layer containing such magnetic powder has improved durability.
REFERENCES:
patent: 3736181 (1973-05-01), Pye
patent: 4169802 (1979-10-01), Basile
patent: 4390361 (1983-06-01), Sueyoshi
patent: 4400432 (1983-08-01), Buxbaum
patent: 4632870 (1986-12-01), Takamatsu
Asada Seiichi
Miyake Akira
Sueyoshi Toshinobu
Hitachi Maxell Ltd.
Thibodeau Paul J.
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