Patents by Inventor Yvonne M. Steen

Yvonne M. Steen 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).

  • Sperm selection process using a salt of hyaluronic acid
    Patent number: 4804537
    Abstract: The present invention relates to a process and means for separating motile sperm cells in vitro from an aqueous sperm-containing sample by means of contacting said sample with a layer of an aqueous artificial penetration medium for sperm cells, said medium having incorportated therein a water-soluble physiologically acceptable salf of hyaluronic acid, whereby motile sperm cells are caused to migrate into said layer from said sperm-containing sample. The invention also comprises fertilization with sperm cells separated in this manner.
    Type: Grant
    Filed: May 22, 1987
    Date of Patent: February 14, 1989
    Assignee: Pharmacia AB
    Inventors: Per O. Bergman, Yvonne M. Steen, Bjorn G. Ingelman