Patents by Inventor Masaji Nukuto

Masaji Nukuto 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).

  • Pipe and heat exchanger, pipe manufacturing device, and pipe manufacturing method
    Patent number: 6840074
    Abstract: A cylindrical pipe which is excellent in heat transfer characteristic and has no accumulation of liquid, wherein a flat-shaped portion (2) along the pipe axis (L) is formed inside the cylindrical pipe (1) formed in corrugated shape. As a method for manufacturing said pipe, the present invention provides a pipe manufacturing method, wherein a thin-wall blank cylindrical pipe (P) is fed in increments of a prescribed distance, while being rotated at a definite speed, a roller die (85) being pressed against the outer periphery of the cylindrical pipe, the roller die being advanced and retracted in accordance with the feed of the cylindrical pipe, for forming a spiral corrugation such that the groove depth thereof is gradually increased, starting from the flat portion of the cylindrical pipe, and reaches a maximum in the portion opposed to the flat one.
    Type: Grant
    Filed: March 11, 2003
    Date of Patent: January 11, 2005
    Inventors: Tojo Kamino, Masaji Nukuto
  • Pipe and heat exchanger, pipe manufacturing device, and pipe manufacturing method
    Publication number: 20030173070
    Abstract: A cylindrical pipe which is excellent in heat transfer characteristic and has no accumulation of liquid, wherein a flat-shaped portion (2) along the pipe axis (L) is formed inside the cylindrical pipe (1) formed in corrugated shape. As a method for manufacturing said pipe, the present invention provides a pipe manufacturing method, wherein a thin-wall blank cylindrical pipe (P) is fed in increments of a prescribed distance, while being rotated at a definite speed, a roller die (85) being pressed against the outer periphery of the cylindrical pipe, the roller die being advanced and retracted in accordance with the feed of the cylindrical pipe, for forming a spiral corrugation such that the groove depth thereof is gradually increased, starting from the flat portion of the cylindrical pipe, and reaches a maximum in the portion opposed to the flat one.
    Type: Application
    Filed: March 11, 2003
    Publication date: September 18, 2003
    Inventors: Tojo Kamino, Masaji Nukuto