Patents by Inventor Josef Pikl

Josef Pikl 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 preparing steroidal acids and their intermediate derivatives
    Patent number: 4172076
    Abstract: Steroidal acids of the formula ##STR1## are prepared from steroidal ketones of the formula ##STR2## wherein R.sub.1 is hydrogen; hydroxy; lower alkyloxy; tetrahydropyranyloxy; aryloxy; alkyl; alkanoyloxy or aroyloxy; R.sub.2 is hydrogen; hydroxy; lower alkyloxy; tetrahydropyranyloxy; aryloxy; alkyl; alkanoyloxy or aroyloxy; R.sub.3 is hydrogen; hydroxy; lower alkyloxy; tetrahydropyranyloxy; aryloxy; alkyl; alkanoyloxy or aroyloxy; with the proviso that R.sub.1 and R.sub.2 together or R.sub.2 and R.sub.3 together may form a carbon-carbon bond; R.sub.4 is --(CH.sub.2).sub.n CO(CH.sub.2).sub.m CH.sub.3 ; R.sub.5 is --(CH.sub.2).sub.n+m+1 COOH; R.sub.
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: October 23, 1979
    Assignee: Diamond Shamrock Corporation
    Inventors: Arnold L. Hirsch, Josef Pikl