Crosstied Patents (Class 238/92)
  • Composite railroad cross-tie
    Patent number: 5055350
    Abstract: A railroad cross-tie made from sand and recycled thermoplastic containers. To practice the invention the containers made of many thermoplastic materials are granulated and mixed together. The labels and small amounts of residue from the original contents remain on the containers. Sand is dried and coated with an adhesive substance. The coated sand and recycled granulated thermoplastic plastics are mixed and heated in a compression mold to form the railroad cross-tie.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: October 8, 1991
    Inventor: Charles W. Neefe
  • Latex-modified, pretensioned and prestressed structures having enhanced structural load bearing capacity
    Patent number: 4151145
    Abstract: This invention relates to a latex-modified, pretensioned, and prestressed concrete structure having at least about a 50% reduction in bond transfer length as compared to a structure not modified by a latex. Such structure is composed of a cured concrete composition comprising a mixture of (1) portland cement, (2) mineral aggregate, and (3) a vinylidene chloride polymer latex, said latex being present in an amount sufficient to provide from about 5 to about 25 percent by weight of polymer solids.
    Type: Grant
    Filed: November 22, 1977
    Date of Patent: April 24, 1979
    Assignee: The Dow Chemical Company
    Inventors: Gale L. Emig, Daniel Moldovan