Patents Assigned to Copper Cliff Door Manufacturing (1980) Limited
  • Door structure
    Patent number: 4478268
    Abstract: A door for closing vehicular traffic passages is provided in which the door is a curtain fabricated from a hard flexible material. The curtain runs in opposing channels, is mounted on a counterbalanced wind-up drum and under impact changes weight, moves out of the channels and is wound up to open the vehicular passage.
    Type: Grant
    Filed: April 1, 1983
    Date of Patent: October 23, 1984
    Assignee: Copper Cliff Door Manufacturing (1980) Limited
    Inventor: Glenn R. Palmer