Patents by Inventor Sidney H. Levinson

Sidney H. Levinson 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).

  • 1,1,1-Trihalo-2-hydroxy-4-(2-hydroxyphenyl)-4-butanones
    Patent number: 4193941
    Abstract: A new synthesis for the preparation of 6-(2-hydrophenyl)-3-pyridazinones whose key reaction is cyclizing a 1,1,1-trihalo-2-hydroxy-4-(2-hydroxyphenyl)-4-butanone with hydrazine. 6-(2-Hydroxyphenyl)-3-pyridazinones are important intermediates for preparing medicinally active compounds especially 3-[2-(3-tert.-butylamino-2-hydroxypropoxy)phenyl]-6-hydrazinopyridazine or its nontoxic acid addition salts. The invention claimed here is the trihalocarbinol intermediates.
    Type: Grant
    Filed: October 5, 1978
    Date of Patent: March 18, 1980
    Assignee: SmithKline Corporation
    Inventors: Sidney H. Levinson, Wilford L. Mendelson
  • 3-(o-Hydroxyphenyl)-5-formylhydrazino-.DELTA..sup.2 -pyrazolines
    Patent number: 4189578
    Abstract: New 3-(o-hydroxyphenyl)-5-formylhydrazino-.DELTA..sup.2 -pyrazolines useful in the preparation of 6-(2-hydrophenyl)-3-pyridazinones which are in turn important intermediates for preparing medicinally active compounds especially 3-[2-(3-tert.-butylamino-2-hydroxypropoxy)phenyl]-6-hydrazinopyridazine.
    Type: Grant
    Filed: March 1, 1979
    Date of Patent: February 19, 1980
    Assignee: SmithKline Corporation
    Inventors: Sidney H. Levinson, Wilford L. Mendelson
  • Synthesis of 6-(2-hydroxyphenyl)-3(2H)-pyridazinones from trihalocarbinols
    Patent number: 4152517
    Abstract: A new synthesis for the preparation of 6-(2-hydroxyphenyl)-3-pyridazinones whose key reaction is cyclizing a 1,1,1-trihalo-2-hydroxy-4-(2-hydroxyphenyl)-1-butanone with hydrazine. 6-(2-Hydroxyphenyl)-3-pyridazinones are important intermediates for preparing medicinally active compounds.
    Type: Grant
    Filed: October 19, 1977
    Date of Patent: May 1, 1979
    Assignee: SmithKline Corporation
    Inventors: Sidney H. Levinson, Wilford L. Mendelson