Patents Assigned to Frances H. Johnson
  • Method and apparatus for increasing the efficiency of internal collection filter bags
    Patent number: 4401446
    Abstract: One or more hollow tubular air channeling members are positioned in the interior of an internal collection type filter bag to separate the incoming dirty air into a plurality of portions essentially confined from each other and to direct these separated and confined portions of dirty air to different interior portions of the bag and thereby increase the effective filtering efficiency of the bag and also increase useful bag life.
    Type: Grant
    Filed: October 28, 1981
    Date of Patent: August 30, 1983
    Assignee: Frances H. Johnson
    Inventor: Allen S. Johnson, Jr.