Patents by Inventor Arno Pfeiffer

Arno Pfeiffer 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).

  • Continuous process for the manufacture of methionine
    Patent number: 4069251
    Abstract: In a continuous process 5-(.beta.-methylmercaptoethyl)-hydantoin is subjected to hydrolysis at an elevated temperature and elevated pressure in an aqueous solution of alkali carbonate or alkali bicarbonate or a mixture of these two compounds. The ammonia and carbon dioxide which form during the hydrolysis are removed and when the hydrolysis is complete the methionine is separated by means of carbon dioxide and the mother liquor is recirculated into the process after replenishing with fresh amounts of said hydantoin.
    Type: Grant
    Filed: August 12, 1976
    Date of Patent: January 17, 1978
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Sven Peter Mannsfeld, Arno Pfeiffer, Herbert Tanner, Hans Wagner, Erich Liebetanz, deceased