Patents Assigned to Marwin Foundry Units Limited
  • Air supply units
    Patent number: 4320755
    Abstract: A main casing 34 contains a centrifugal fan 10, a filter unit 12 upstream, and a duct 14 downstream for guiding air to a face mask. There is a center plate 36 to which a motor 18, the fan 10, a battery 20 etc. are secured. A back plate 32 is removable to provide access to the electrical components. The filter unit 12 is held in position by an apertured cap 24.
    Type: Grant
    Filed: July 18, 1980
    Date of Patent: March 23, 1982
    Assignee: Marwin Foundry Units Limited
    Inventors: Leslie Flint, Malcolm P. Brown