Patents by Inventor Mineo Okuma

Mineo Okuma 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).

  • Spark plug for an internal combustion engine
    Patent number: 6794803
    Abstract: At least one of a center electrode and a ground electrode of an engine spark plug is a Ni-base alloy containing, in weight percentage, 0.5˜2.5% Si, 0.1˜1.2% Mn, 3.2˜5.0% Al, 0.9˜2.8% Cr, 0.001˜0.025% C in addition to Ni and unavoidable impurities. And, a value S/V is in a range from 1.7 mm−1 to 3.9 mm−1 when ‘S’ represents a surface area of the ground electrode and ‘V’ represents a volume of the ground electrode.
    Type: Grant
    Filed: March 14, 2002
    Date of Patent: September 21, 2004
    Assignee: Denso Corporation
    Inventors: Tsunenobu Hori, Yasutake Ishino, Hironori Osamura, Akira Mitsuhashi, Mineo Okuma
  • Spark plug for an internal combustion engine
    Publication number: 20030038575
    Abstract: At least one of a center electrode and a ground electrode of an engine spark plug is a Ni-base alloy containing, in weight percentage, 0.5˜2.5% Si, 0.1˜1.2% Mn, 3.2˜5.0% Al, 0.9˜2.8% Cr, 0.001˜0.025% C in addition to Ni and unavoidable impurities. And, a value S/V is in a range from 1.7 mm−1 to 3.9 mm−1 when ‘S’ represents a surface area of the ground electrode and ‘V’ represents a volume of the ground electrode.
    Type: Application
    Filed: March 14, 2002
    Publication date: February 27, 2003
    Inventors: Tsunenobu Hori, Yasutake Ishino, Hironori Osamura, Akira Mitsuhashi, Mineo Okuma