Patents by Inventor Jorg Spanig

Jorg Spanig 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 preparation of derivatives of bis(amino-methyl) phosphinic acid
    Patent number: 5510504
    Abstract: A process for the preparation of .alpha.- or .alpha.,.alpha.'-substituted derivatives of the bis(aminomethyl)phosphinic acid of the formula I and their acid or basic salts, ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 are defined as in the description, wherein a bis(aminomethyl)phosphinate is converted into the corresponding bisimine, which is alkylated by R.sup.2 and R.sup.3 in the .alpha.- and/or .alpha.,.alpha.'-position after reaction with a base, and is converted into a compound of the formula I by subsequent treatment with an acid.
    Type: Grant
    Filed: January 4, 1995
    Date of Patent: April 23, 1996
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Anuschirwan Peyman, Karl-Heinz Budt, Jorg Spanig, Jian-Qi Li, Bernd Stowasser