Patents by Inventor Leslie N. Hansen

Leslie N. Hansen 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).

  • Airtight door
    Patent number: 4936049
    Abstract: An airtight door of the type including at least one sliding panel mounted in a guide track and supported by a plurality of rollers and sealed by a seal structure and provided with a heat wire, tape or strip to establish a frost free seal. The structure disclosed is adapted for use in a door as illustrated and also is adapted for use in sliding windows or similar closures.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: June 26, 1990
    Inventor: Leslie N. Hansen