Patents by Inventor Hans-Gunther Frohlen

Hans-Gunther Frohlen 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).

  • Preparation of alkane phosphonic and phosphinic acid aryl esters
    Patent number: 4377537
    Abstract: A process for the preparation of an alkane phosphonic acid diaryl ester or an alkane phosphinic acid aryl ester of the formula ##STR1## wherein R.sup.1 is C.sub.1 -C.sub.20 alkyl or alkenyl group,R.sup.2 is a C.sub.1 -C.sub.20 alkyl or alkenyl group or a C.sub.6 -C.sub.10 aryl or aryloxy group,R.sup.3 is C.sub.6 -C.sub.10 aryl group,k is 0 or 1,p is 1 or 2,k+p=2,plus an alkane phosphonic acid diaryl ester, alkane phosphinic acid aryl ester or phosphine oxide of the formula ##STR2## R.sup.4 and R.sup.5 each independently is C.sub.1 -C.sub.20 alkyl group, a C.sub.6 -C.sub.10 aryl group or a C.sub.6 -C.sub.10 aryloxy group,R.sup.6 is C.sub.1 -C.sub.
    Type: Grant
    Filed: January 2, 1981
    Date of Patent: March 22, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans-Dieter Block, Hans-Gunther Frohlen