Patents by Inventor John R. Dunkle

John R. Dunkle 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).

  • Reference electrode
    Patent number: 5397452
    Abstract: A reference electrode including a body, a supply of flowable gel electrolyte, a wire electrode, and a tube for the electrolyte. The electrolyte is preferably contained in a cartridge within the body of the electrode and is capable of being dispensed into the tube in very small, metered, amounts, as needed.
    Type: Grant
    Filed: May 27, 1994
    Date of Patent: March 14, 1995
    Assignee: Hach Company
    Inventors: Michael D. Buck, Steven Zelenak, John R. Dunkle, Gary W. Johnson, James D. McWilliams
  • Electrode with crystal membrane
    Patent number: 5393402
    Abstract: An improved electrode is described having a replaceable cap in which a crystal membrane is mechanically secured. Leakage around the crystal membrane is avoided. The cap can be easily and quickly replaced, as desired.
    Type: Grant
    Filed: February 9, 1994
    Date of Patent: February 28, 1995
    Assignee: Hach Company
    Inventors: Nelson E. Dervaes, John R. Dunkle