Patents by Inventor Johannes F. Van Der Grift

Johannes F. Van Der Grift 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).

  • Container for liquid observed for impurities
    Patent number: 5261546
    Abstract: The invention relates to a substantially transparent container for liquids on one side of which are opaque light and opaque dark areas of color observable through the container for evaluating contained liquid for particulate impurities. The container is particularly useful for pharmaceutical liquids.
    Type: Grant
    Filed: July 15, 1991
    Date of Patent: November 16, 1993
    Assignee: Mallinckrodt Medical, Inc.
    Inventor: Johannes F. Van Der Grift