Patents by Inventor Friedrich Engelhardt

Friedrich Engelhardt 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).

  • Method of purifying monoalcohols
    Patent number: 3966829
    Abstract: A process for purifying a primary monoalcohol being admixed with diol impurities containing primary and secondary hydroxyl groups without appreciably affecting the primary hydroxyl groups of said admixture, which comprises passing a mixture of said diol and said monoalcohol at a temperature of about 170.degree. to 220.degree.C in the liquid phase over a gamma-alumina catalyst.
    Type: Grant
    Filed: September 27, 1974
    Date of Patent: June 29, 1976
    Assignee: Deutsche Texaco Aktiengesellschaft
    Inventors: Friedrich Engelhardt, Karl Erhard, Gundolf Fuchs
  • Sulfonyl compounds
    Patent number: 3966769
    Abstract: Compounds of the formulaR -- SO.sub.2 -- Xwherein X is ##EQU1## R and R.sup.5 are aryl, aralkyl, heteroaryl, cycloalkyl or alkyl; R.sup.1 and R.sup.4 are R, hydrogen, carboxy or carboxylate; R.sup.2 is aryl, aralkyl, cycloalkyl or alkyl; R.sup.3 is R.sup.2 or hydrogen; Y is alkylene, cycloalkylene or phenylene, Y.sup.1 is Y or a direct bond and Z is alkylene, hydroxy substituted alkylene, alkylene interrupted by a hetero atom or ##EQU2## and methods of preparing the same.
    Type: Grant
    Filed: February 22, 1974
    Date of Patent: June 29, 1976
    Assignee: Cassella Farbwerke Mainkur Aktiengesellschaft
    Inventors: Steffen Piesch, Friedrich Engelhardt
  • Polymers based on N-formyl-N'-acryloyl-methylenediamines
    Patent number: 3966689
    Abstract: Linear addition polymers of a compound of the formula ##EQU1## wherein R.sup.1, R.sup.2 and R.sup.3 are hydrogen or alkyl having 1 to 5 carbon atoms, said polymers being thermally crosslinkable at temperatures below 100.degree.C. to produce moulded products, lacquers and coatings and to fix pigments to fibers and films of natural and synthetic origin.
    Type: Grant
    Filed: January 30, 1975
    Date of Patent: June 29, 1976
    Assignee: Cassella Farbwerke Mainkur Aktiengesellschaft
    Inventors: Joachim Ribka, Friedrich Engelhardt, Steffen Piesch