Patents by Inventor Johann Karl Forrer

Johann Karl Forrer 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 preparing hydroxylammonium salts
    Patent number: 4048291
    Abstract: A process for making hydroxyl ammonium salts by hydrogenation of nitric oxide in an acid medium in the presence of a platinum catalyst, wherein the catalyst contains 15 to 50 atom percent of selenium and the acid medium is at least 2N during the reaction. A new catalyst and method of making it are also disclosed.
    Type: Grant
    Filed: May 2, 1975
    Date of Patent: September 13, 1977
    Assignee: Inventa AG fur Forschung und Patentverwertung
    Inventors: Hussain El-Ghatta, Johann Karl Forrer
  • Process for preparing platinum metal catalysts
    Patent number: 3996165
    Abstract: Novel platinum catalysts and a method for their preparation are disclosed. They are prepared by treating catalysts of platinum metal with salts of sulfurous acid or with sulfur compounds which liberate sulfurous acid in the presence of an acid. The treatment is conducted in the presence of hydroxylammonium salts in acid medium and in the absence of oxidizing agents capable of oxidizing sulfurous acid to form sulfate. The resulting catalysts are useful in preparing hydroxylamine.
    Type: Grant
    Filed: December 24, 1974
    Date of Patent: December 7, 1976
    Assignee: Inventa AG fur Forschung und Patentverwertung
    Inventors: Hussain El-Ghatta, Johann Karl Forrer
  • Process for reactivating platinum catalysts used in production of hydroxylammonium salts
    Patent number: 3966635
    Abstract: A process for reactivating platinum catalysts is disclosed. It comprises treating a platinum catalyst having reduced activity and selectivityA. in a first stage with an acid solution of a sulfur compound which liberates sulfurous acid in acid medium, and a hydroxylammonium salt, said treatment being conducted in the absence of oxidizing agents capable of oxidizing sulfurous acid to sulfate, andB. in a second stage with an acid solution of platinum (II) or platinum (IV) compounds in the presence of hydrogen.
    Type: Grant
    Filed: March 17, 1975
    Date of Patent: June 29, 1976
    Assignee: Inventa AG fur Forschung und Patentverwertung
    Inventors: Hussain El-Ghatta, Johann Karl Forrer
  • Process for preparing catalysts containing platinum metal
    Patent number: 3956469
    Abstract: A process is disclosed whereby an improved platinum metal-containing catalyst is prepared. Standard platinum metal catalysts are treated with sulfur compounds which liberate sulfurous acid in acid media. The sulfur compounds contain 15 to 150 atom % of sulfur based on the platinum metal present. The treatment is conducted in the presence of hydroxylammonium salts in acid media and in the absence of reducing agents which are capable of reducing sulfurous acid to sulfide.
    Type: Grant
    Filed: October 7, 1974
    Date of Patent: May 11, 1976
    Assignee: Inventa AG fur Forschung und Patentverwertung
    Inventors: Hussain El-Ghatta, Johann Karl Forrer
  • Process for reacting nitric oxide with hydrogen
    Patent number: 3954946
    Abstract: Method and apparatus for reacting nitric oxide with H.sub.2 in the presence of noble metal catalysts in which waste gas is obtained by separating the gas contained in a liquid medium flowing countercurrently to the bubbles in a counter-current bubble column. Preferably, only a portion of the separated gas is removed as waste gas, the remainder being recycled. The apparatus comprises a counter-current bubble column having a gas recycling circuit to permit the recycling of excess NO contained in the separated gas.
    Type: Grant
    Filed: July 18, 1974
    Date of Patent: May 4, 1976
    Assignee: Inventa AG fur Forschung und Patentverwertung, Zurich
    Inventors: Werner Graf, Johann Karl Forrer