Patents Assigned to Hollingsowrth & Vose Company
  • Charge stabilized electret filter media
    Patent number: 6780226
    Abstract: An electret filter media includes an additive or mixtures thereof that enhance the charge stability of the media. The filter media achieves acceptable alpha values for a range of filtration challenges without significant decay in alpha values over time. Preferred charge additives include fatty acid amides, oleophobic fluorochemical surfactants, and mixtures thereof.
    Type: Grant
    Filed: April 5, 1996
    Date of Patent: August 24, 2004
    Assignee: Hollingsowrth & Vose Company
    Inventors: Norman Lifshutz, Richard E. Gahan, Graham C. Stevens