Patents by Inventor Masakatu Mayumi

Masakatu Mayumi 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).

  • Method for producing reinforced plastic tubular body having annular grooves, and mold therefor
    Patent number: 4263249
    Abstract: A mold for the production of a reinforced plastic tubular body having an annular groove such as a pipe coupling, the mold having a mold body and detachably mounted on a predetermined position thereof, an annular groove former consisting of a surface layer of an elastic material and a core covered with the surface layer. The reinforced plastic tubular body is produced by forming a layer of a molding material around the aforesaid mold, curing the layer of molding material, separating the mold body from the cured layer of molding material, and then separating the annular groove former from the cured layer of molding material by removing the core and then removing the surface layer.
    Type: Grant
    Filed: June 26, 1979
    Date of Patent: April 21, 1981
    Assignee: Sekisui Kagaku Kogyo Kabushiki Kaisha
    Inventors: Masakatu Mayumi, Kenji Mitooka, Sigeharu Fujiwara, Takesi Okuyama