Patents by Inventor Alfred Schmidt

Alfred Schmidt 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).

  • Process for the preparation of guanidine carbonate
    Patent number: 3952057
    Abstract: Process for obtaining guanidine carbonate from aqueous solutions in which it is present with urea and its pyrolysis products as well as ammonia and carbon dioxide, which comprises heating the aqueous solution to a temperature of at most 80.degree.C at atmospheric pressure, evaporating the resulting solution, which contains an amount of carbon dioxide equal to the guanidine content, until it is saturated with urea, separating the solid precipitate, suspending the mother liquor in liquid ammonia and separating the resulting guanidine carbonate.
    Type: Grant
    Filed: July 3, 1973
    Date of Patent: April 20, 1976
    Assignee: Chemie Linz AG
    Inventors: Alfred Schmidt, Karlheinz Wegleitner, Josef Herbert Hatzl, Rudolf Sykora, Ferdinand Weinrotter