Patents by Inventor Alf Haggkvist

Alf Haggkvist 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).

  • Duct and seal assembly
    Patent number: D551336
    Type: Grant
    Filed: May 8, 2006
    Date of Patent: September 18, 2007
    Assignee: Eastern Sheet Metal, Inc.
    Inventor: Alf Haggkvist
  • Duct seal
    Patent number: D553238
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: October 16, 2007
    Assignee: Eastern Sheet Metal
    Inventor: Alf Haggkvist