Patents by Inventor Siegfried Duchstein

Siegfried Duchstein 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).

  • Casting perlite before the swine
    Patent number: 4310552
    Abstract: A swine, hog and pig fodder which comprises the customary digestible meal or grain component, e.g. soy or bran meal, in combination with an indigestible blown perlite additive with a particle size up to 5 mm and preferably between 0 and 2 mm. The fodder can contain 10 to 50 volume % blown perlite which may store in its open-pore structure physiologically or medicinally effective substances such as medicaments, trace elements essential to nutrition and vitamins.
    Type: Grant
    Filed: June 26, 1979
    Date of Patent: January 12, 1982
    Inventor: Siegfried Duchstein