Patents Assigned to Hy-Roll Manufacturing, Inc.
  • Roll door
    Patent number: 4896714
    Abstract: A roll door assembly has a flexible roll door rollingly supported in a frame; a counterweight assembly employing fixed and movable pulleys and a counterweight retains the roll door taut.
    Type: Grant
    Filed: March 24, 1987
    Date of Patent: January 30, 1990
    Assignee: Hy-Roll Manufacturing, Inc.
    Inventor: Arthur S. Ellis