Patents by Inventor John V. Burgoyne

John V. Burgoyne 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 ballast block
    Patent number: 4535579
    Abstract: A roof ballast block having generally rectangular top and bottom faces and two parallel edges bevelled at substantially identical angles of 12.degree. to 23.degree. from the vertical, the remaining two edges being substantially vertical, the block having a plurality of parallel spaced channels in its bottom face and being characterized by a density of 85 to 155 pounds per cubic foot, a compressive strength of at least 2500 psi, a flexure strength of at least 300 psi, and a capability of undergoing at least 100 freeze-thaw cycles without cracking.
    Type: Grant
    Filed: August 5, 1983
    Date of Patent: August 20, 1985
    Assignee: Roofblok Limited
    Inventors: John V. Burgoyne, Thomas E. Phalen, Jr.