Patents Examined by I. Coda
  • Patent number: 5003690
    Abstract: A finning and thread rolling machine capable of producing an integral finned tube, an extended finned tube or a wrap-on finned tube, whichever is desired, the tubing to be used for extended surface heat transfer. Types of tubes produced are integral low finned tube, bi-metal fin tube with extruded high finned tube on the outer portion, and extruded integral/high finned tube and spiral strip helical wrap-on finned tube. The apparatus also provides a two and three die thread rolling machine for thru-feed threading and form rolling.
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: April 2, 1991
    Inventor: Ray C. Anderson