Process for production of magnetic recording medium
Patent 4354909 Issued on October 19, 1982. Estimated Expiration Date: 
February 25, 2000. 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.
February 25, 2000. 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 ReferencesIonized-cluster deposited on a substrate and method of depositing ionized cluster on a substrate Process for the production of a magnetic recording medium Patent #: 4226681 InventorsAssigneeApplicationNo. 06/124235 filed on 02/25/1980US Classes:427/531, Metal or metal alloy plating or implanted material427/128, Magnetic coating427/132, Metal coating427/250, Metal coating427/295, Metal base427/296, Organic base427/523, Ion plating or implantation427/525, Organic material present in substrate, plating, or implanted layer427/561, Pretreatment of coating supply or source outside of primary deposition zone or off site427/599Magnetic recording medium or device formedExaminersPrimary: Pianalto, BernardAttorney, Agent or FirmInternational ClassesH01F 10/18 (20060101)C23C 14/00 (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 polyethylene terephthalate film, and deposited on the surface of the substrate by an ionized cluster beam deposition method, at least one ferro-magnetic 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. | |
