Magnetic recording medium
Patent 4642270 Issued on February 10, 1987. Estimated Expiration Date: 
November 27, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 27, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.InventorsAssigneeApplicationNo. 06/675302 filed on 11/27/1984US Classes:428/621, With additional, spatially distinct nonmetal component427/131, Applying superposed diverse coating or coating a coated base427/132, Metal coating428/626, Synthetic resin428/637, Group VIII or IB metal-base428/666, Cr-base component428/667, Next to Co-, Fe-, or Ni-base component428/679, Co- or Ni-base component next to Fe-base component428/830Plural magnetic layers of same empirical composition, each with different structure (e.g., differing crystalline lattice, atomic structure, etc.)ExaminersPrimary: O'Keefe, VeronicaAttorney, Agent or FirmInternational ClassG11B 5/66 (20060101)Foreign Application Priority Data1983-11-29 JPAbstractIn a magnetic recording medium comprising a non-magnetic substrate and a magnetic thin film formed on the surface thereof and including at least two layers, the upper layer in the form of a crystalline cobalt-chromium alloy layer suitable for perpendicular magnetization is placed on the lower layer in the form of an amorphous layer of permalloy having high permeability and low coercive force. | |
