Magnetic recording medium
Patent 4382110 Issued on May 3, 1983. Estimated Expiration Date: 
December 11, 2001. 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 11, 2001. 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 Patent #: 4202932 InventorsAssigneeApplicationNo. 06/330019 filed on 12/11/1981US Classes:428/336, 1 mil or less428/457, Of metal428/836.1, Metal or alloy magnetic layer428/900MAGNETIC FEATUREExaminersPrimary: Pianalto, BernardAttorney, Agent or FirmInternational ClassesC23C 14/00 (20060101)H01F 10/18 (20060101) H01F 10/10 (20060101) H01F 41/14 (20060101) G11B 5/84 (20060101) G11B 5/64 (20060101) G11B 5/851 (20060101) Foreign Application Priority Data1979-02-23 JPAbstractA magnetic recording medium comprising a non-magnetic substrate such as on polyethylene terephthalate film, and deposited on the surface of the substrate by a ionized cluster beam deposition method, at least one ferromagnetic material selected from the group consisting of cobalt, cobalt-containing alloys, mixtures of cobalt with other elements, and chromium dioxide; and a process for production thereof. The magnetic recording medium is characterized by having superior magnetic properties, especially superior coercive force, residual magnetic flux density and squareness ratio, and high mechanical strength. | |
