Patents by Inventor Tsunetoshi Itoh

Tsunetoshi Itoh 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).

  • Apparatus for protecting of coal mine workers
    Patent number: 4067618
    Abstract: An apparatus for protecting coal mine workers from flying coal, rocks, coal dust, scattering coal and the like, which are produced as a drum shearer works in a longwall coal face. The apparatus is provided with isolated walls or chambers between iron props installed in the self-advancing supports provided in the longwall coal face by use of fastening members. The isolated wall or chamber is connected with its adjacent wall or chamber by a flexible connecting member.
    Type: Grant
    Filed: September 24, 1976
    Date of Patent: January 10, 1978
    Assignee: Taiheiyo Engineering Inc.
    Inventors: Shigeo Nakajima, Ken Takahashi, Tsunetoshi Itoh, Hajime Endo