Patents by Inventor Chikako Sasao

Chikako Sasao 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).

  • Wire material for coil expander and coil expander
    Patent number: 7954822
    Abstract: A wire material for a coil expander capable of manufacturing a coil expander that is unlikely to cause disadvantages such as abnormal wear and resultant reduction in strength The wire material for a coil expander is used for a coil expander of a combination piston ring having a piston ring and the coil expander for pressing and urging the piston ring outward in the radial direction thereof, wherein a cross-sectional shape thereof is a rectangular shape, and when the coil expander is formed by using the wire material for a coil expander, the surface of the wire material for a coil expander, constituting an outer peripheral surface of the coil expander, is formed into a convex curved shape.
    Type: Grant
    Filed: January 7, 2005
    Date of Patent: June 7, 2011
    Assignees: Nippon Piston Ring Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Nobuyuki Matsushima, Chikako Sasao, Takao Suzuki
  • Wire material for coil expander and coil expander
    Publication number: 20090243225
    Abstract: A wire material for a coil expander capable of manufacturing a coil expander that is unlikely to cause disadvantages such as abnormal wear and resultant reduction in strength. The wire material for a coil expander is used for a coil expander of a combination piston ring having a piston ring and the coil expander for pressing and urging the piston ring outward in the radial direction thereof, wherein a cross-sectional shape thereof is a rectangular shape, and when the coil expander is formed by using the wire material for a coil expander, the surface of the wire material for a coil expander, constituting an outer peripheral surface of the coil expander, is formed into a convex curved shape.
    Type: Application
    Filed: January 7, 2005
    Publication date: October 1, 2009
    Inventors: Nobuyuki Matsushima, Chikako Sasao, Takao Suzuki