Patents Assigned to Polycrate (Proprietary) Limited
  • Method of injection molding structural foam folding slat structures
    Patent number: 3953560
    Abstract: The invention relates to structures such as folding (tambour) doors comprising longitudinal juxtaposed slats and comprises a method of making such structures by introducing a molten synthetic resinous mass containing a foaming agent into a mould, permitting foaming of the mass and compressing the mass with a ribbed mould plunger to a predetermined distance above the floor of the mould to constitute the hinges.
    Type: Grant
    Filed: August 28, 1974
    Date of Patent: April 27, 1976
    Assignee: Polycrate (Proprietary) Limited
    Inventor: Andre Klein