Patents by Inventor Giselher Fritz

Giselher Fritz 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 use in mining or tunnelling installations
    Patent number: 4055959
    Abstract: Apparatus for use in mining or tunnelling installations comprises a shield for housing excavation machinery, and a floor sill for supporting said machinery. The shield is constituted by a plurality of generally cylindrical sections. Means are provided for advancing the shield whilst the floor sill is held stationary. Means are also provided for advancing the floor sill whilst the shield is held stationary.
    Type: Grant
    Filed: November 29, 1976
    Date of Patent: November 1, 1977
    Assignee: Gewerkschaft Eisenhutte Westfalia
    Inventor: Giselher Fritz