Patents Assigned to Cawm-Crete International Limited
  • Fire door construction
    Patent number: 4364987
    Abstract: This invention discloses a core for a fire-resistant door with wooden stiles and rails forming the peripheral edge and a slab filling the space therebetween comprising a cured mixture of magnesium oxi-chloride with inclusions of fibreglass strands and perlite. Also disclosed is a method of making same in which the wooden stiles and rails form the sides of a mold and the core is formed by pouring a mixture on a flat surface with a non-adhering coating and curing the core in place so that it bonds to the stiles and rails.
    Type: Grant
    Filed: August 27, 1981
    Date of Patent: December 21, 1982
    Assignee: Cawm-Crete International Limited
    Inventor: Walter A. Goodwin