Patents by Inventor Eiji Senda

Eiji Senda 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).

  • Electrical insulator string with bullet-proof protective rings
    Patent number: 4731507
    Abstract: A bullet-proof board includes a pair of steel plates of substantially identical thicknesses that sandwich a thick intermediate layer therebetween and a thin surface layer secured to that steel plate surface which faces a striking bullet. The intermediate and surface layers are made of such chemical fiber cloths or synthetic resin plates which absorb energy of a striking bullet. The bullet-proof board may be formed in the shape of a sidewall of a truncated-cone and secured to a suspension insulator for protecting it against gun shooting.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: March 15, 1988
    Assignee: NGK Insulators, Ltd.
    Inventors: Soichi Torimoto, Eiji Senda, Morio Nishikawa, Kenji Tanaka