Patents by Inventor Steffen Piesch

Steffen Piesch 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).

  • Preparation of electrolyte-free aminoplast resins
    Patent number: 4163835
    Abstract: Electrolyte-free etherified methylolaminotriazines are directly prepared by reacting together in the absence of electrolyte, the aminotriazine, formaldehyde and certain ether-alcohols. When the formaldehyde to aminotriazine mol ratio is sufficiently high and the etherification sufficiently extensive, the resulting products are particularly desirable in that they are quite stable and thermoset to exceptionally elastic, cured products having high electrical, moisture, and temperature resistance.
    Type: Grant
    Filed: January 19, 1977
    Date of Patent: August 7, 1979
    Assignee: Cassella Aktiengesellschaft
    Inventor: Steffen Piesch
  • Modified aminoplast compositions
    Patent number: 4076662
    Abstract: N-formyl- or N-acetyl-aminomethyl ethers make very effective plasticizers for aminoplast resins and are particularly desirable for plasticizing such resins in resin-impregnated cellulosic products.
    Type: Grant
    Filed: December 15, 1976
    Date of Patent: February 28, 1978
    Assignee: Cassella Farbwerke Mainkur Aktiengesellschaft
    Inventors: Karl Schnee, Steffen Piesch, Dieter Tichy
  • Aminoplast curing agents
    Patent number: 4031064
    Abstract: Maleamic and fumaramic acids and certain of their derivatives make very good curing agents for converting aminoplast condensates to cured resins.
    Type: Grant
    Filed: April 18, 1975
    Date of Patent: June 21, 1977
    Assignee: Cassella Farbwerke Mainkur Aktiengesellschaft
    Inventors: Karl Schnee, Dieter Tichy, Steffen Piesch
  • 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
  • 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