Patents by Inventor Roger A. Ristau

Roger A. Ristau has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Chromium-alloy seedlayers for recording media
    Patent number: 6756136
    Abstract: A magnetic recording medium on glass or Al substrates with a film structure of Cr—X or (Cr—X)Ox seedlayer/underlayer/magnetic layer/carbon overcoat, in which the solid solubility of X is at least 3 atomic percent in Cr, the heat of oxide formation of X is less than that of Cr or a lattice tuning capability of X is at least 2% that of Cr and a manufacturing process thereof are disclosed.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: June 29, 2004
    Assignee: Seagate Technology LLC
    Inventors: Samuel Dacke Harkness, IV, Roger Ristau, Li-Lien Lee, Rajiv Yadav Ranjan
  • Perpendicular recording media with enhanced coercivity
    Patent number: 6541131
    Abstract: A perpendicular magnetic recording medium having a substrate and an annealed magnetic layer comprising boron on the substrate, the magnetic layer being a single film and having an L10 structure, and a process for manufacturing the perpendicular magnetic recording medium are disclosed.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: April 1, 2003
    Assignee: Seagate Technology LLC
    Inventor: Roger A. Ristau