Patents by Inventor A. Prasad

A. Prasad 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 dithiophosphoric acid diester-halides
    Patent number: 4154780
    Abstract: A process for the preparation of a dithiophosphoric acid diester-halide of the formula ##STR1## IN WHICH R.sup.1 is alkyl with 1 to 10 carbon atoms, aralkyl with 1 to 6 carbon atoms in the alkyl radical, or alkoxyalkyl or alkylthioalkyl with 1 to 5 carbon atoms in each alkyl radical,R.sup.2 is alkyl with 1 to 8 carbon atoms, andHal is halogen,Which comprises reacting an S-alkyl or S-aralkyl ester of a dithiophosphoric acid dihalide of the formula ##STR2## WITH ABOUT A 5 TO 300% MOLAR EXCESS OF AN ALCOHOL OF THE FORMULAR.sup.2 OHin the presence of about a 5 to 300% molar excess of a tertiary pyridine base or tertiary aralkyl-alkylamine at a temperature between about -10.degree. and +60.degree. C.
    Type: Grant
    Filed: March 31, 1977
    Date of Patent: May 15, 1979
    Assignees: Bayer Aktiengesellschaft, Mobay Chemical Corporation
    Inventors: Reimer Colln, Hermann Arold, Vidyanatha A. Prasad