Patents by Inventor Yoshihumi Ajishi

Yoshihumi Ajishi 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).

  • Magnetic recording medium and manufacturing process thereof
    Patent number: 6673476
    Abstract: A magnetic recording medium has a non-magnetic ground layer, a non-magnetic recording layer, a protecting layer formed sequentially on a non-magnetic substrate, one on top of another. A double-layered non-magnetic ground layer consists of a pure chromium layer, positioned closer to a substrate, and a chromium-molybdenum-tungsten ternary alloy layer, positioned closer to a magnetic recording layer. This provides the non-magnetic recording layer formed on such a ground layer with cobalt alloy grains having uniform dimensions. The resulting magnetic recording medium has an excellent SNR.
    Type: Grant
    Filed: November 28, 2001
    Date of Patent: January 6, 2004
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Yoshiharu Kashiwakura, Yoshihumi Ajishi, Tetsu Ikegami
  • Magnetic recording medium and manufacturing process thereof
    Publication number: 20020114979
    Abstract: A magnetic recording medium has a non-magnetic ground layer, a non-magnetic recording layer, a protecting layer formed sequentially on a non-magnetic substrate, one on top of another. A double-layered non-magnetic ground layer consists of a pure chromium layer, positioned closer to a substrate, and a chromium-molybdenum-tungsten ternary alloy layer, positioned closer to a magnetic recording layer. This provides the non-magnetic recording layer formed on such a ground layer with cobalt alloy grains having uniform dimensions. The resulting magnetic recording medium has an excellent SNR.
    Type: Application
    Filed: November 28, 2001
    Publication date: August 22, 2002
    Inventors: Yoshiharu Kashiwakura, Yoshihumi Ajishi, Tetsu Ikegami
  • Method for cleaning a glass substrate for a magnetic recording medium, a glass substrate cleaned by such a method, and a magnetic recording medium using such a substrate
    Publication number: 20020015863
    Abstract: Abrasive grains are removed from a glass substrate for a recording medium by washing with water containing an elevated amount of oxygen atoms. The oxygen atoms may be in the form of monatomic diatomic or triatomic molecules. In one embodiment, the oxygen is formed at the anode of an electrolysis apparatus. A small amount of an electrolyte may be used in the electrolysis apparatus without interfering with the ability to clean the glass substrate without generating latent flaws. The invention also is defined as a substrate cleaned by the disclosed method and a magnetic recording medium made from the substrate.
    Type: Application
    Filed: April 25, 2001
    Publication date: February 7, 2002
    Inventors: Norihiko Nakajima, Noboru Kurata, Yoshihumi Ajishi, Miki Shido