Patents by Inventor Katumi Yamakawa

Katumi Yamakawa 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).

  • Buried marker
    Patent number: 5467729
    Abstract: Information of the type, number, burying depth and direction of a pipe or other objects buried in the ground is identified on the ground surface. There is provided a buried marker comprising an identifying plate having indicia thereon and an interconnect band for interconnecting the identifying plate to the object buried in the ground. The position where the pipe or other object is buried is thus easily identified.
    Type: Grant
    Filed: September 28, 1993
    Date of Patent: November 21, 1995
    Assignee: Thomas & Betts Corporation
    Inventors: Yoshio Yamada, Katumi Yamakawa