Patents by Inventor Karl Sperr

Karl Sperr 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).

  • Metal frame assembly for windows or doors
    Patent number: 4614062
    Abstract: A metal frame assembly for windows or doors, comprising at least two sections that are joined together via an insulating strip, wherein the insulating strip is provided with a channel to accommodate a seal.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: September 30, 1986
    Assignee: Swiss Aluminium Ltd.
    Inventor: Karl Sperr