Patents Assigned to Frederick L. Fichter
  • Filtration module
    Patent number: 4088463
    Abstract: The filtration module is adapted to be installed in groups occupying all or a substantial portion of a wall or ceiling area in a room. The filter elements are replaceable from inside the room without disassembly or removal of the housing structure. The filter elements are held in secure sealing relationship against recessed edge surfaces by an easily removed retaining frame normally secured to the housing with fastenings accessible from within the room.
    Type: Grant
    Filed: May 5, 1976
    Date of Patent: May 9, 1978
    Assignee: Frederick L. Fichter
    Inventor: Irwin M. Smith