Patents by Inventor Friedrich Schophoff

Friedrich Schophoff 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).

  • Process for the preparation of finished dyeings which are fast to thermomigration: orange-dyed polyester fabrics
    Patent number: 5288680
    Abstract: The present invention relates to a process for the preparation of finished dyeings of high fastness to thermomigration on fibre materials consisting completely or partly of polyester, characterized in that the material is dyed with one or more dyestuffs of the general formula I ##STR1## wherein R denotes linear (C.sub.1 -C.sub.3)-alkyl or (C.sub.3 -C.sub.6)-alkyl which is interrupted by an oxygen atom andR.sup.1 denotes (C.sub.1 -C.sub.4)-alkyl,and the dyeing thus obtained is then finished.
    Type: Grant
    Filed: May 22, 1992
    Date of Patent: February 22, 1994
    Assignee: Cassella Aktiengesellschaft
    Inventors: Rudolf Binder, Ulrich Buhler, Friedrich Schophoff, Margareta Boos, Reinhard Kuhn
  • Color-stable beta-modification of a monoazo dye, a process for its preparation, and its use
    Patent number: 5069682
    Abstract: The present invention relates to the .beta.-modification of the dye of the formula I ##STR1## to a process for its preparation, to its use, and to a dye preparation containing it.
    Type: Grant
    Filed: December 21, 1990
    Date of Patent: December 3, 1991
    Assignee: Cassella Aktiengesellschaft
    Inventors: Rudolf Binder, Friedrich Schophoff, Klaus Hofmann
  • Preparation of azo dyestuffs by diazotization and coupling in the presence of an ester
    Patent number: 4795807
    Abstract: Azo disperse dyestuffs are prepared by diazotization and coupling in an aqueous phase, the coupling being carried out in the presence of an ester of a lower aliphatic carboxylic acid.
    Type: Grant
    Filed: March 30, 1987
    Date of Patent: January 3, 1989
    Assignee: Cassella Aktiengesellschaft
    Inventors: Ulrich Buhler, Friedrich Schophoff, Wolf Weidemuller
  • Process for the preparation of 2,4-dinitrophenyl ethers
    Patent number: 4695656
    Abstract: 2,4-Dinitrophenyl ethers are prepared by reacting a 2,4-dinitrochlorobenzene or 2,4-dinitrobromobenzene with an alkali metal alcoholate in a non-polar, inert solvent, at a temperature from -25.degree. C. to 50.degree. C.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: September 22, 1987
    Assignee: Cassella Aktiengesellschaft
    Inventors: Kuno Reh, Friedrich Schophoff
  • Process for the preparation of 2,4-dinitrophenol alkoxyalkyl ethers
    Patent number: 4686301
    Abstract: Process for the preparation of compounds of the formula (I) ##STR1## in which R denotes a C.sub.1 -C.sub.4 -alkyl radical which is optionally substituted by C.sub.1 -C.sub.4 -alkoxy groups, or a phenyl radical which can be substituted by alkyl or alkoxy groups having 1 to 4 carbon atoms or by chlorine or bromine atoms, or, together with R.sub.2, denotes an alkylene bridge --(CH.sub.2).sub.n -- in which n is the number 3 or 4, R.sub.1 denotes a hydrogen atom or an alkyl radical having 1 to 4 carbon atoms, and R.sub.2 represents a hydrogen atom or an alkyl radical having 1 to 4 carbon atoms, or, together with R, represents an alkylene bridge --(CH.sub.2).sub.n -- in which n has the meaning mentioned, by reacting 2,4-dinitrochlorobenzene with an alcohol of the formula (II) ##STR2## in which R, R.sub.1 and R.sub.2 have the meanings mentioned above, in the presence of lithium oxide or lithium hydroxide at temperatures from 0.degree. to 5.degree. C.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: August 11, 1987
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Theodor Papenfuhs, Friedrich Schophoff