Patents Assigned to Polyfiltronics N.A., Inc.
  • Filter units
    Patent number: 5208161
    Abstract: An assay filter unit where the filter of the unit is sealed into the body of the unit to prevent any passage of material to be assayed round the edge of the filter but is removable by breaking out a filter support grid along a predetermined line of weakness, together with the filter, for assay of material retained on the filter.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: May 4, 1993
    Assignee: Polyfiltronics N.A., Inc.
    Inventors: Anthony J. Saunders, Roy L. Manns