Patents by Inventor Bruno Knopfli

Bruno Knopfli 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).

  • Process and apparatus for the production of expanded grids
    Patent number: 5461761
    Abstract: A sheet-metal strip provided with mutually staggered cuts is conveyed continuously at a first speed through a first conveying apparatus (23) and at a second speed, increased as related to the first speed, through a second conveying apparatus (24). Thereby, the strip section (21) freely traveling between the first and second conveying apparatus (23, 24) is stretched with the formation of a three-dimensional expanded grid structure. The process permits a continuous, rapid production of expanded grids of high precision and uniformity, especially with regard to mesh width and grid height.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: October 31, 1995
    Assignee: Kuhni AG.
    Inventors: Bruno Knopfli, Ulrich Buhlmann