Patents by Inventor Mark D. Lewandowski

Mark D. Lewandowski 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).

  • Retractable in house open stairwell cover
    Patent number: 6739100
    Abstract: A stairwell cover adapted to seal a stairwell opening such as between a first floor living space and a basement when the basement is not in use includes a housing mounted to a wall partition above the base of the stairs, a retractable cover rotatably mounted in the housing, and a pair of roller rails extending along the sidewalls of the stairwell and along which the cover rolls for movement between an retracted position providing open access to the basement and an extended position closing off the basement at the top of the stairwell.
    Type: Grant
    Filed: January 10, 2003
    Date of Patent: May 25, 2004
    Inventor: Mark D. Lewandowski