Patents by Inventor Edward A. Pfannkoch

Edward A. Pfannkoch 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).

  • Method for high pH washing of silica-based chromatographic sorbents
    Patent number: 4808233
    Abstract: Chromatographic sorbents containing silica are cleaned by using a caustic wash solution having a caustic agent dissolved in water and having aluminum or gallium ions present at an effective concentration so as to prevent deterioration of the sorbent. Caustic solutions having a pH above 8 can be used with a preferred solution having a pH above 13. The cleaning solutions typically have aluminum or gallium ions present at a concentration of from about 0.0005 to 0.1 normal.
    Type: Grant
    Filed: July 2, 1987
    Date of Patent: February 28, 1989
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Edward A. Pfannkoch