Patents by Inventor Kenji Ouwa

Kenji Ouwa 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).

  • Shaft part formed with a rolling groove
    Patent number: 8573081
    Abstract: A shaft part is formed with a rolling groove (5) on which rolling elements (4) roll. At least the rolling groove (5) is induction hardened with no generation of black colored oxidized scale after the induction hardening. A surface of the induction hardened rolling groove (5) is used “as is” as a rolling surface. The surface roughness Ra of the induction hardened surface “as is” of the rolling groove (5) is less than 1.0. The ratio of effective hardened depth of a hardened layer is between 0.15 and 0.45.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: November 5, 2013
    Assignee: NTN Corporation
    Inventors: Hiroyuki Uchida, Kenji Ouwa, Kazuho Mimura, Kazuhiko Yoshida
  • Shaft Part Formed With A Rolling Groove
    Publication number: 20120031211
    Abstract: A shaft part is formed with a rolling groove (5) on which rolling elements (4) roll. At least the rolling groove (5) is induction hardened with no generation of black colored oxidized scale after the induction hardening. A surface of the induction hardened rolling groove (5) is used “as is” as a rolling surface. The surface roughness Ra of the induction hardened surface “as is” of the rolling groove (5) is less than 1.0. The ratio of effective hardened depth of a hardened layer is between 0.15 and 0.45.
    Type: Application
    Filed: October 21, 2011
    Publication date: February 9, 2012
    Applicant: NTN Corporation
    Inventors: Hiroyuki Uchida, Kenji Ouwa, Kazuho Mimura, Kazuhiko Yoshida