Patents by Inventor Reinhardt O. Sahmel

Reinhardt O. Sahmel 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).

  • Para-hydroxyphenylhydrazines as in situ precursors of iminoquinones and quinones
    Patent number: 4459227
    Abstract: Iminoquinone precursors having the formula ##STR1## wherein R.sub.1 represents hydrogen or an enzymatically hydrolyzable group; R.sub.2 and R.sub.3 independently represent hydrogen, a non-electron-withdrawing organic substituent or an enzymatically hydrolyzable group except that when R.sub.1 is hydrogen, R.sub.2 must be an enzymatically hydrolyzable group and R.sub.3 must not inhibit the hydrolysis of R.sub.2 ; R.sub.4 represents hydrogen or an electron-withdrawing or non-electron-withdrawing organic substituent, except that if R.sub.1 is hydrogen, R.sub.4 may not inhibit the hydrolysis of R.sub.2 ; W, X, Y and Z independently represent hydrogen or an electron-withdrawing or non-electron-withdrawing organic substituent, or any one of X and W, Y and Z, or X and R.sub.
    Type: Grant
    Filed: March 2, 1981
    Date of Patent: July 10, 1984
    Assignee: Duke University
    Inventors: Reinhardt O. Sahmel, Doyle G. Graham