Patents by Inventor Hans-Rudolf Wuhrmann

Hans-Rudolf Wuhrmann 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).

  • Method of manufacturing ion-selective electrodes for analyzing selected ions in solution
    Patent number: 4867860
    Abstract: There is disclosed a process for producing a laminar electrode. The method comprises successive superposition of an insulating support, a conductive layer, a stable-potential internal reference element and an ion-selective diaphragm, all of which are protected by a mask which is impermeable to aqueous solutions. A completely tight seal between the mask and the ion-selective diaphragm is formed by casting the diaphragm in the form of a solution containing a binder which dissolves with and intimately mixes with the mask material.
    Type: Grant
    Filed: December 16, 1986
    Date of Patent: September 19, 1989
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Iqbal Siddiqi, Hans-Rudolf Wuhrmann
  • Selectively ion-permeable dry electrodes for analyzing selected ions in aqueous solution
    Patent number: 4859306
    Abstract: The electrode comprises an internal reference half-cell at stable potential comprising a conductive sheet, e.g. of metal of carbon, covered by a redox system. The redox system comprises a thin dehydrated layer of Prussian blue deposited by contact between the sheet and a mixture of alkaline ferrocyanide and a ferric salt.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: August 22, 1989
    Assignee: Hoffman-La Roche Inc.
    Inventors: Iqbal Siddiqi, Hans-Rudolf Wuhrmann