Patents by Inventor by Margot M. C. Himmelreich, executor

by Margot M. C. Himmelreich, executor 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).

  • Tungsten hexaldialkyldithiocarbamates, process for their preparation and oil compositions containing them
    Patent number: 5308519
    Abstract: Novel tungsten hexa(dialkyldithiocarbamates) of the general formula I ##STR1## in which R and R.sup.1 can be identical or different, branched or straight-chain, saturated or unsaturated alkyl radicals having 1-18 carbon atoms are prepared by a process in which 6 mols of an alkali metal dialkyldithiocarbamate of the general formula II ##STR2## in which R and R.sup.1 are as signified above and Me can be sodium, potassium or ammonium, are reacted with 1 mol of tungsten hexachloride in a solvent which is inert with respect to the reaction. The alkali metal chloride or ammonium chloride formed is separated off and the tungsten hexa(dialkyldithiocarbamate) is isolated. The tungsten hexa(dialkyldithiocarbamates) of the invention can be used as additives for prolonging the life of hydraulic oils or permanent gear lubrication oils.
    Type: Grant
    Filed: September 25, 1992
    Date of Patent: May 3, 1994
    Inventors: Wolfram Spiess, Friedrich Franke, Rolf Himmelreich, deceased, by Margot M. C. Himmelreich, executor, by Petra Himmelreich, heir, by Ralf Himmelreich, heir