Patents by Inventor Wilhelm K. Schropp

Wilhelm K. Schropp 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).

  • Removal of aldehydes from .alpha., .beta.-olefinically unsaturated carboxylic acids
    Patent number: 4828652
    Abstract: Aldehydes are removed from .alpha.,.beta.-olefinically unsaturated monocarboxylic acids of 3 or 4 carbon atoms by adding hydrazine derivatives and distilling the unsaturated monocarboxylic acids if the hydrazine derivatives used are aminoguanidine and/or aminoguanidine salts in amounts of from 1 to 3 moles per mole of aldehyde.
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: May 9, 1989
    Assignee: BASF Aktiengesellschaft
    Inventor: Wilhelm K. Schropp
  • Method of stabilizing monomeric acrylic acid esters against premature polymerization and esters thus stabilized
    Patent number: 4310676
    Abstract: A mixture of phenothiazine and para-nitrosophenol is a particularly effective stabilizer against premature polymerization of monomeric esters of acrylic acid with alkanols of 1 to 8 carbon atoms.
    Type: Grant
    Filed: July 2, 1980
    Date of Patent: January 12, 1982
    Assignee: BASF Aktiengesellschaft
    Inventor: Wilhelm K. Schropp