Patents by Inventor Dagny B. Hessel

Dagny B. Hessel 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).

  • Preparation of blood fraction
    Patent number: 4229435
    Abstract: Concentrates of one of the coagulation factors II, V and VIII or a mixture thereof or blood plasma free from one or more of the coagulation factors VII, IX, X, XI and XII can be prepared by adding a reducing substance comprised of dithiothreitol, dithioerythritol, lipoic acid, mercaptoethanol, or a borohydride to blood or plasma, dithiothreitol being preferred. The amount of reducing substance and the period of time for interaction are so adapted to obtain the product desired, whereafter the blood and plasma, respectively, are optionally fractionated in a known manner.
    Type: Grant
    Filed: January 23, 1979
    Date of Patent: October 21, 1980
    Inventors: Birger E. G. Blomback, Dagny B. Hessel