Magnetic recording medium
Patent 4599280 Issued on July 8, 1986. Estimated Expiration Date: 
April 25, 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.
April 25, 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.Patent ReferencesMetallic thin film magnetic recording medium Magnetic recording medium and apparatus for preparing the same Method for producing a perpendicular magnetic recording medium Magnetic recording medium Magnetic recording medium with vacuum deposited magnetic layer Magnetic recording medium Patent #: 4454195 InventorsAssigneeApplicationNo. 06/603668 filed on 04/25/1984US Classes:428/836.2, Magnetic layer having oxygen (i.e., uncombined or oxide)360/134, Tape360/135, Disk360/136, Drum427/128, Magnetic coating427/132, Metal coating427/529, Inorganic oxide containing plating or implanted material428/900MAGNETIC FEATUREExaminersPrimary: Robinson, Ellis P.Attorney, Agent or FirmInternational ClassG11B 5/85 (20060101)Foreign Application Priority Data1983-04-25 JPAbstractIn a magnetic recording medium comprising a length of a non-magnetic plastic substrate and a magnetic thin layer of Co or Co-Ni or Co-Ni-Cr formed thereon, when the coercive force of the medium is measured by changing the measuring direction in a plane defined by a longitudinal direction of the substrate and a direction normal to the major surface of the substrate, the following relationship is met:where Hcmax is the maximum coercive force, Hcmin is the minimum coercive force, and Hc(0) is a coercive force in the longitudinal direction of the substrate.Other References
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