Patents by Inventor Holger Alexis Persson

Holger Alexis Persson 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).

  • Patent number: 3948291
    Abstract: A stiffening device for filter hoses of square crosssection includes two substantially identically shaped wires or strips. Each wire or strip is bent along a single plane repeatedly substantially at right angles to each other to form a zig-zag configuration having alternate longitudinally and transversely extending portions. The length of each of the transversely extending portions correspond to the diagnonal measurement of the hose. The two wires or strips are connected with each other at the centre points of the transversely extending portions and at right angles to the individual plane of those portions.
    Type: Grant
    Filed: May 17, 1974
    Date of Patent: April 6, 1976
    Assignee: AB Bahco Ventilation
    Inventor: Holger Alexis Persson