Patents Assigned to Flexmaster U.S.A., Inc.
  • Access door
    Patent number: 4667449
    Abstract: An access door for an air conditioning duct or the like has a circular frame intended to be rotated into a circular opening in the duct wall. The frame has an inwardly extending circular shoulder against which abuts a removable circular door held in place by latch means engaging within a circular groove formed in the frame.
    Type: Grant
    Filed: March 4, 1986
    Date of Patent: May 26, 1987
    Assignee: Flexmaster U.S.A., Inc.
    Inventors: Henry M. Keating, Kirby C. Fortenberry