Patents Assigned to John Weyeth & Brother Limited
  • Process and apparatus for freezing a liquid medium
    Patent number: 4470202
    Abstract: Spherical frozen particles, which may be subsequently freeze dried are prepared by introducing a liquid medium in the form of droplets beneath the surface of a cooling liquid. The temperature and density of the cooling liquid is chosen so that liquid droplets freeze as they float towards the surface of the cooling liquid. Preferably a column of cooling liquid is employed and the liquid medium is introduced through an inlet near the base of the column.
    Type: Grant
    Filed: November 26, 1982
    Date of Patent: September 11, 1984
    Assignee: John Weyeth & Brother Limited
    Inventors: Ian R. Buxton, James M. Peach