Patents by Inventor Kurt H. Schaaf

Kurt H. Schaaf 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).

  • Hydrolysis of 5-(beta-methylmercaptoethyl)-hydantoin
    Patent number: 4272631
    Abstract: 5-(Beta-methylmercaptoethyl)-hydantoin is hydrolyzed at superatmospheric pressure in an autoclave by heating in a mixture of (a) a hydroxide of a monovalent cation such as lithium, sodium, potassium, ammonium or alkyl substituted ammonium and (b) a hydroxide of a divalent cation such as calcium, barium or zinc.
    Type: Grant
    Filed: February 25, 1980
    Date of Patent: June 9, 1981
    Assignee: Diamond Shamrock Corporation
    Inventors: Kurt H. Schaaf, Herman Horn
  • Methionine process
    Patent number: 4259525
    Abstract: Methionine is prepared from 5-(beta-methylmercaptoethyl)-hydantoin at atmospheric pressure by refluxing the hydantoin with a metal hydroxide such as sodium hydroxide, potassium hydroxide, or barium hydroxide and an alkanol having a boiling point of from about 125.degree. C. to about 230.degree. C. at atmospheric pressure, preferably, a water saturated alkanol having a boiling point of from about 125.degree. C. to about 230.degree. C. at atmospheric pressure and thereafter recovering methionine.
    Type: Grant
    Filed: October 1, 1979
    Date of Patent: March 31, 1981
    Assignee: Diamond Shamrock Corporation
    Inventor: Kurt H. Schaaf