Patents Represented by Attorney Craig Crandall

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  • Use of hydrophobic interaction chromatography to purify polyethylene glycols
    Patent number: 5747639
    Abstract: The present invention relates to a process for purifying polyethylene glycols (PEGs) which utilizes hydrophobic interaction chromatography (HIC) to separate the PEGs based on their size and on their end-group functionality. The purified PEGs can be used to modify biologically active molecules and improve overall production of such molecules.
    Type: Grant
    Filed: March 6, 1996
    Date of Patent: May 5, 1998
    Assignee: Amgen Boulder Inc.
    Inventor: James Ervin Seely