Patents by Inventor Ludwig Schroff

Ludwig Schroff 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).

  • Manufacture of aralkylarylamines and alkylarylamines
    Patent number: 4423247
    Abstract: Aromatic amines are N-alkylated by reacting primary or secondary amines with dialkyl carbonates. The products are starting materials for the manufacture of dyes, crop protection agents and scents.
    Type: Grant
    Filed: September 21, 1978
    Date of Patent: December 27, 1983
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Ludwig Schroff, deceased
  • Manufacture of p-alkylphenols
    Patent number: 4198531
    Abstract: p-alkylphenols are manufactured by continuous reaction of phenol with olefins in the presence of a pulverulent polystyrenesulfonic acid ion exchanger which is suspended in the reaction mixture.
    Type: Grant
    Filed: October 14, 1977
    Date of Patent: April 15, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Max Strohmeyer, Gerhard Sandrock, Heinz Hohenschutz, Ludwig Schroff, Gerhard Nestler
  • Preparation of aralkyl phenyl ethers and alkyl phenyl ethers
    Patent number: 4192949
    Abstract: Phenol ethers are prepared by reacting phenols with dialkyl carbonates in the presence of tertiary amines and/or phosphines. The aralkyl aryl ethers and alkyl aryl ethers obtained are starting materials for the manufacture of dyes, crop protection agents and scents.
    Type: Grant
    Filed: June 15, 1978
    Date of Patent: March 11, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Franz Merger, Friedrich Towae, Ludwig Schroff, deceased