Patents by Inventor Daniel E. Houk

Daniel E. Houk 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 the rapid removal of protoporphyrin from protoporphyrin IX-containing solutions of hemoglobin
    Patent number: 5665869
    Abstract: The present invention relates to a method for the production of a substantially protoporphyrin IX free hemoglobin solution comprising: rapidly heating a crude protoporphyrin IX-containing hemoglobin solution for a relatively short time and at a relatively high temperature to reduce protoporphyrin IX-containing hemoglobin to insignificant levels in said protoporphyrin IX-containing hemoglobin solution.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: September 9, 1997
    Assignee: Somatogen, Inc.
    Inventors: James R. Ryland, Maura-Ann H. Matthews, Ulrich P. Ernst, Daniel E. Houk, David W. Traylor, Lee R. Williams