Patents by Inventor Minoru Numakura

Minoru Numakura 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).

  • Traction drive rolling element and method of forming the same
    Patent number: 6881126
    Abstract: A method of forming a traction drive rolling element including: forming a preform having a working surface with an arcuate profile in section taken along a central axis; supporting the preform to be rotatable about the central axis; allowing a relative movement between the preform and a grooving tool for moving the grooving tool along the arcuate profile, simultaneously with rotating the preform about the central axis, to form microscopic recesses and projections alternately arranged in a direction perpendicular to the central axis along the arcuate profile; pressing a grindstone having a contact surface area of 25 mm2 or less, on the working surface; and allowing a relative movement between the preform and the grindstone for moving the grindstone along the arcuate profile simultaneously with rotating the preform while keeping pressing the grindstone on the working surface until a height of the microscopic projections becomes 3 ?m or less.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: April 19, 2005
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tatsuomi Nakayama, Minoru Ota, Minoru Numakura, Mamoru Saito, Hidenori Watanabe
  • Traction drive rolling element and method of forming the same
    Publication number: 20040082272
    Abstract: A method of forming a traction drive rolling element including: forming a preform having a working surface with an arcuate profile in section taken along a central axis; supporting the preform to be rotatable about the central axis; allowing a relative movement between the preform and a grooving tool for moving the grooving tool along the arcuate profile, simultaneously with rotating the preform about the central axis, to form microscopic recesses and projections alternately arranged in a direction perpendicular to the central axis along the arcuate profile; pressing a grindstone having a contact surface area of 25 mm2 or less, on the working surface; and allowing a relative movement between the preform and the grindstone for moving the grindstone along the arcuate profile simultaneously with rotating the preform while keeping pressing the grindstone on the working surface until a height of the microscopic projections becomes 3 &mgr;m or less.
    Type: Application
    Filed: October 17, 2003
    Publication date: April 29, 2004
    Applicant: NISSAN MOTOR CO., LTD.
    Inventors: Tatsuomi Nakayama, Minoru Ota, Minoru Numakura, Mamoru Saito, Hidenori Watanabe