Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Physical dimension specified
Patent
1990-08-24
1991-08-27
Thibodeau, Paul J.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Physical dimension specified
428694, 428900, G11B 2300
Patent
active
050432125
ABSTRACT:
A magnetic recording medium having plural magnetic layers is disclosed. The magnetic recording medium comprises a first magnetic layer containing magnetic powder having a coercive force of less than 800 Oe and a BET value of less than 45 m.sup.2 /g, a second magnetic layer containing magnetic powder having a coercive force of not less than 800 Oe and a BET value of less than 45 m.sup.2 /g and a third magnetic layer containing magnetic powder having a coercive force of not less than 800 Oe and a BET value of not less than 45 m.sup.2 /g, in this order.
REFERENCES:
patent: 4409281 (1983-10-01), Kitamoto et al.
patent: 4847147 (1989-07-01), Aonuma et al.
patent: 4851289 (1989-07-01), Ogawa et al.
patent: 4873129 (1989-10-01), Fukke
Ando Yasuo
Kenpo Tsutomu
Bierman Jordan B.
Konica Corporation
Thibodeau Paul J.
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