Patents by Inventor Hideyasu Hayakawa

Hideyasu Hayakawa 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).

  • Device for preventing gland nut in valve from loosening
    Patent number: 5938173
    Abstract: A device for preventing a polygonal gland nut helically coupled with the stem of a valve from loosening includes a locking piece inserted non-rotatable on the stem. A pair of engaging claws are formed on the locking piece to engage with one of the lateral faces of the gland nut and also with two lateral faces of the gland nut adjoining each other straddled an intervening corner of the gland nut.
    Type: Grant
    Filed: February 11, 1998
    Date of Patent: August 17, 1999
    Assignee: Kitz Corporation
    Inventor: Hideyasu Hayakawa