Patents by Inventor Erich Ziegler

Erich Ziegler 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).

  • Aromatic citrus oil concentrate which is stable in storage
    Patent number: 4508747
    Abstract: Peel oil concentrate produced from cold-pressed citrus peel by adsorption at a solid separating agent which adsorbs polar organic substances or by extraction with a polar liquid solvent. The peel oil concentrate is a stabilizing agent for a natural citrus aroma concentrates.
    Type: Grant
    Filed: October 6, 1983
    Date of Patent: April 2, 1985
    Inventor: Erich Ziegler
  • Aromatic citrus oil concentrate which is stable in storage
    Patent number: 4435437
    Abstract: Peel oil concentrate produced from cold-pressed citrus peel by adsorption at a solid separating agent which adsorbs polar organic substances or by extraction with a polar liquid solvent. The peel oil concentrate is a stabilizing agent for a natural citrus aroma concentrates.
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: March 6, 1984
    Inventor: Erich Ziegler
  • Process for the manufacture of pyrono-condensed coumarins
    Patent number: 4154741
    Abstract: A new process for the manufacture of pyrono-condensed coumarin compounds by reacting an anil derivative of a heterocyclic compound with a cyanoacetic acid derivative in the presence of a base and a strong polar aprotic solvent is described.
    Type: Grant
    Filed: December 27, 1977
    Date of Patent: May 15, 1979
    Assignee: Ciba-Geigy Corporation
    Inventors: Erich Ziegler, Otto Wolfbeis