Patents by Inventor Sydney A. Barker

Sydney A. Barker 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).

  • Biologically active conjugates and their preparation and use
    Patent number: 4663287
    Abstract: Water-soluble, biologically active conjugates comprising residues of (1) a biologically active protein or glycoprotein having primary amino groups, (2) a heteropolymer of D-mannuronic acid and L-guluronic acid and (3) an alkyleneglycol of 2 to 6 carbon atoms, the said residue (2) being linked to (1) by an amide linkage and to (3) by an ester linkage, which conjugates have increased activity at higher pH values and higher temperatures and a process for their preparations.
    Type: Grant
    Filed: June 14, 1984
    Date of Patent: May 5, 1987
    Assignee: Gist-Brocades N.V.
    Inventor: Sydney A. Barker