Patents by Inventor Otto Schallner

Otto Schallner 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).

  • Aqueous process for the preparation of aromatic phosphorus compounds
    Patent number: 4279813
    Abstract: Phosphorus-containing compounds especially azo dyestuffs containing a grouping of the formula ##STR1## standing in ortho-position to the azo bridge are obtained in good yield if compounds of the formula ##STR2## are reacted with compounds of the formula ##STR3## in aqueous medium at a pH of 6-9 in the presence of copper or copper containing compounds.The process is less expensive than applying the conventional solvent method.In the above formulae:K=radical of a coupling component,V.sub.1 -V.sub.3 =H or non-ionic radical,X and Y=--OR, --SR, --NR.sub.2 or R,R=optionally substituted hydrocarbon radical,Z=--OR', --SR' or --NR'.sub.2 andR'=H or R.
    Type: Grant
    Filed: May 29, 1979
    Date of Patent: July 21, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Otto Schallner, Rainer Hamprecht