Patents by Inventor Friedrich Zartnack

Friedrich Zartnack 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).

  • Making heart valves
    Patent number: 4575442
    Abstract: A heart valve is to remain with a homogenic and smooth configuration whereby particularly unevennesses tending to form loci for depositions are to be avoided. The method is basically comprised of separately forming the flap vanes through multiple coatings and the valve case is separately made but combined with the flap vane through a common coating procedure to obtain smooth transition surfaces.
    Type: Grant
    Filed: December 23, 1983
    Date of Patent: March 11, 1986
    Assignee: Ewald Hennig
    Inventors: Ewald Hennig, Emil S. Buecherl, Friedrich Zartnack