High density magnetic recording media
Patent 4197347 Issued on April 8, 1980. Estimated Expiration Date: 
July 19, 1998. 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.
July 19, 1998. 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 ReferencesProcess for production of ferromagnetic powder Patent #: 4063000 InventorsApplicationNo. 05/926069 filed on 07/19/1978US Classes:428/328, Heavy metal or aluminum or compound thereof148/105, Particulate material252/62.55, Free metal or alloy containing360/134, Tape360/135, Disk360/136, Drum427/128, Magnetic coating427/216, Metal base428/329, Iron oxide or aluminum oxide428/336, 1 mil or less428/339, Including synthetic resin or polymer layer or component428/842.3, Ferromagnetic (elemental or alloy) particles428/900, MAGNETIC FEATURE75/347, Utilizing magnetism75/367Vaporizing or condensing free metalExaminersPrimary: Silverman, Stanley S.Attorney, Agent or FirmInternational ClassesB22F 9/12 (20060101)B22F 9/02 (20060101) G11B 5/71 (20060101) G11B 5/712 (20060101) G11B 5/708 (20060101) G11B 5/706 (20060101) Foreign Application Priority Data1977-07-22 JPAbstractA magnetic recording medium comprising a nonmagnetic support having thereon a magnetic recording layer of a ferromagnetic powder dispersed in a binder, wherein the ferromagnetic powder is a low vacuum evaporation process ferromagnetic metal powder subjected to a surface oxidation stabilizing processing and the low vacuum evaporation process ferromagnetic metal powder is one processed with an aqueous solution containing at least one anionic surface active agent. | |
