Patents by Inventor Kenzo Nishitani

Kenzo Nishitani 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 coupling two plastic constructive parts used in valve, joint and pipe devices
    Patent number: 4845819
    Abstract: Two plastic tubelike members on which an annular protrusion or an annular groove are respectively provided to be used as two constructive block members for assembling valve or joint devices are directly coupled to assemble such devices. Critical dimensional relationships on the coupling end having the annular groove are established wherein a deformation process can be controlled to engage the annular groove with the annular protrusion by a radially widening motion and an axially spring motion in elastic dynamics, while the coupling end having the annular groove is softened by heating to become elastic. High coupling accuracy can be secured with high coupling strength and durability.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: July 11, 1989
    Assignee: Kubota Limited
    Inventors: Junsuke Kyomen, Masayuki Sakaguchi, Hideki Kajiwara, Keiji Matsumoto, Kenzo Nishitani, Yoshinori Kawamura, Katsuro Ishihara, Masakazu Tanaka