Patents by Inventor Elisabeth Mullhaupt

Elisabeth Mullhaupt 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 of making an absorbent paper-containing granulate
    Patent number: 5100600
    Abstract: A method of making an absorbent granulate of paper, with or without additives, includes mechanically comminuting paper into irregular and/or strip-shaped fragments, crumpling and interlacing the fragments with attendant development of internal spaces (cavities) in the interlaced and crumpled fragments, rough pressing the interlaced and crumpled fragments into prepressed formations (e.g., into tubes having a diameter of up to or even in excess of 10 mm), and converting the prepresssed formations into particles, particularly into granules or pellets. The crumpling and interlacing step can include agitating the fragments in one or more streams of a gaseous fluid and/or kneading the fragments.
    Type: Grant
    Filed: December 7, 1990
    Date of Patent: March 31, 1992
    Assignee: Fritz Keller
    Inventors: Fritz Keller, Elisabeth Mullhaupt