Patents Assigned to Lindsay Concrete Products Co., Inc.
  • Vault door and mix for casting same
    Patent number: 5050507
    Abstract: A burglary resistant cast door assembly for use in a burglary resistant vault is cast of a concrete mix consisting essentially of Type 1 cement from about 21.6 to 25.4 percent by weight; sand from about 31.5 to 37.2 by weight; #8 gravel from about 30.7 to 36.8 by weight; a water reducer from about 0.4 to 0.7 by weight; steel fiber from about 2.3 to 5.1 by weight; and water from about 3.8 to 5.4 by weight.
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: September 24, 1991
    Assignee: Lindsay Concrete Products Co., Inc.
    Inventor: Leslie Shoyat