Patents by Inventor Jan J. Markus

Jan J. Markus 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).

  • Sliding door, meant especially to be used in fire protection or insulation
    Patent number: 4185418
    Abstract: Sliding door, meant especially to be used in fire protection or insulation, whereby the sliding door comprises a framework consisting of a number of profiles on which framework panels are attached.
    Type: Grant
    Filed: December 28, 1977
    Date of Patent: January 29, 1980
    Assignee: Markus Hermetische Deuren B. V.
    Inventor: Jan J. Markus