Magnetic recording medium
Patent 5458948 Issued on October 17, 1995. Estimated Expiration Date: 
December 2, 2013. 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.
December 2, 2013. 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 ReferencesMagnetic recording medium Magnetic recording medium Magnetic recording medium Patent #: 5258223 InventorsAssigneeApplicationNo. 161150 filed on 12/02/1993US Classes:428/141, Continuous and nonuniform or irregular surface on layer or component (e.g., roofing, etc.)428/323, Including a second component containing structurally defined particles428/328, Heavy metal or aluminum or compound thereof428/332, Physical dimension specified428/336, 1 mil or less428/633, Plural oxides428/900MAGNETIC FEATUREExaminersPrimary: Kiliman, L.Attorney, Agent or FirmForeign Patent References
International ClassesB32B 003/10B32B 005/16 G11B 005/66 Foreign Application Priority Data1992-12-18 JPAbstractA magnetic recording medium comprises a non-magnetic support and provided thereon, in order, a non-magnetic layer containing a non-magnetic powder, and a magnetic layer containing a ferromagnetic metal powder, each layer containing a binder, the crystallite size of the magnetic powder determined according to X-ray measurement being 30 to 120 Å and the dry thickness of the magnetic layer being 0.01 to less than 0.5 μm. | |
