Patents by Inventor Lowell E. Putnam

Lowell E. Putnam 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).

  • Roof and method of preparation
    Patent number: 4045934
    Abstract: Ponding is eliminated or substantially reduced on flat roofs by employing a closed cell, thermally insulating foam above the water barrier layer and varying the thickness of the closed cell foam to displace at least a majority of water which might accumulate in areas subject to ponding.
    Type: Grant
    Filed: April 2, 1976
    Date of Patent: September 6, 1977
    Assignee: The Dow Chemical Company
    Inventors: James P. Sheahan, Lowell E. Putnam