Patents Assigned to Ronald S. Welty
  • Air duct plug
    Patent number: 4964438
    Abstract: An air duct plug is provided for obturating an open end of an air duct during periods of nonuse to prevent or limit the escape of cooled or heated air through said air duct, in a dwelling, public building or structure thereof. The plug further provides a depending handle for ease of removal from the air duct when it is determined that said air duct should be used.
    Type: Grant
    Filed: October 2, 1989
    Date of Patent: October 23, 1990
    Assignee: Ronald S. Welty
    Inventor: Ronald S. Welty