Patents by Inventor Helga Hoffmann

Helga Hoffmann 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).

  • Karl fischer reagent
    Patent number: 6946298
    Abstract: A reagent for the determination of water content of a sample according to the Karl Fischer method is disclosed. The reagent comprises a base component comprised of a mixture of imidazole and a substituted imidazole. Preferably, the Karl Fischer reagent is a one component reagent comprising imidazole and 2-methylimidazole.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: September 20, 2005
    Assignee: Sigma-Aldrich Co.
    Inventors: Helga Hoffmann, Katrin Schöffski
  • Karl fischer reagent
    Publication number: 20020127726
    Abstract: A reagent for the determination of water content of a sample according to the Karl Fischer method is disclosed. The reagent comprises a base component comprised of a mixture of imidazole and a substituted imidazole. Preferably, the Karl Fischer reagent is a one component reagent comprising imidazole and 2-methylimidazole.
    Type: Application
    Filed: November 15, 2001
    Publication date: September 12, 2002
    Applicant: Sigma-Aldrich Co.
    Inventors: Helga Hoffmann, Katrin Schoffski