Patents by Inventor Larry P. Landrigan

Larry P. Landrigan 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).

  • Fire and liquid seals for pipes and conduits and method of forming same
    Patent number: 4086736
    Abstract: A fire and/or liquid seal in a structural wall has a tube-like support extending through the wall with conduits positioned in the support and surrounded by insulation material in the form of silicone foam in one embodiment or packed ceramic fibers in another embodiment with protective shield means being clamped to the support and the conduits on the opposite sides of the wall; in another embodiment a layer of silicone elastomer is provided in a tube-like support extending through the wall adjacent a layer of silicone insulating foam surrounding conduits extending through the support in a penetration seal.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: May 2, 1978
    Assignee: Daniel International Corporation
    Inventor: Larry P. Landrigan