Patents by Inventor Otto Schaffner

Otto Schaffner 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 manufacture of 2-chloroethane-phosphonic acid
    Patent number: 4018819
    Abstract: An improved process for the manufacture of 2-chloroethane phosphonic acid in which 2-chloroethane phosphonic acid bis(2-chloroethyl)-ester is heated with excess hydrogen chloride in the presence of 0.1 to 31% by weight of water at temperatures above 100.degree. C under pressure, the 1,2-dichloroethane formed during the reaction is continuously or discontinuously distilled off and the decrease in pressure is compensated by adding gaseous hydrogen chloride.
    Type: Grant
    Filed: August 19, 1975
    Date of Patent: April 19, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl Rehn, Otto Schaffner, Gerhard Stahler