Patents by Inventor Frank H. Verhoff

Frank H. Verhoff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Media milling
    Patent number: 6604698
    Abstract: This invention describes a process for preparing a dispersion of solid particles of a milled substrate in a fluid carrier comprising the steps of (a) providing a plurality of large size milling media to the milling chamber of a media mill and forming a depth filter therefrom on an exit screen or separator in the milling chamber; (b) adding to said milling chamber a plurality of small size milling media optionally containing additional large size milling media, a conglomerate of a solid substance comprising a substrate to be milled and optionally one or more than one surface active substance, and a fluid carrier; (c) milling said conglomerate in said milling chamber to produce very small milled substrate product particles; and (d) separating said milled substrate particles suspended in said fluid carrier from the media through said depth filter; wherein the exit screen comprises openings of size S0; the large size media have a size distribution S1 of which all are larger than S0; the small size media have a si
    Type: Grant
    Filed: May 10, 2001
    Date of Patent: August 12, 2003
    Assignee: SkyePharma Canada, Inc.
    Inventors: Frank H. Verhoff, Robert A. Snow, Gary W. Pace
  • Media milling
    Publication number: 20020003179
    Abstract: This invention describes a process for preparing a dispersion of solid particles of a milled substrate in a fluid carrier comprising the steps of (a) providing a plurality of large size milling media to the milling chamber of a media mill and forming a depth filter therefrom on an exit screen or separator in the milling chamber; (b) adding to said milling chamber a plurality of small size milling media optionally containing additional large size milling media, a conglomerate of a solid substance comprising a substrate to be milled and optionally one or more than one surface active substance, and a fluid carrier; (c) milling said conglomerate in said milling chamber to produce very small milled substrate product particles; and (d) separating said milled substrate particles suspended in said fluid carrier from the media through said depth filter; wherein the exit screen comprises openings of size S0; the large size media have a size distribution S1 of which all are larger than S0; the small size media have a si
    Type: Application
    Filed: May 10, 2001
    Publication date: January 10, 2002
    Inventors: Frank H. Verhoff, Robert A. Snow, Gary W. Pace