Patents by Inventor Egon Joerchel

Egon Joerchel 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 concentrated tetrafluoroboric acid
    Patent number: 4061723
    Abstract: Process for the preparation of a concentrated tetrafluoroboric acid from boron/oxygen compounds and hydrogen fluoride by reacting a solid boron/oxygen compound with a hydrogen fluoride-containing gas.
    Type: Grant
    Filed: November 12, 1976
    Date of Patent: December 6, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Manfred Feser, Egon Joerchel, Jurgen Korinth
  • Production of phosphorus nitrides
    Patent number: 4044104
    Abstract: Phosphorus nitrides of the general formula PN.sub.x, in which x stands for a number of 0.9 up to 1.7 are made. To this end, phosphorus halides are reacted with ammonia in gas phase, the ammonia being used in excess based on the phosphorus halides, and the resulting reaction product is heated to temperatures of up to 950.degree. C until ammonia practically ceases to be evolved from the reaction product.
    Type: Grant
    Filed: April 13, 1976
    Date of Patent: August 23, 1977
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Joseph Cremer, Egon Joerchel, Heinz Harnisch