Patents by Inventor Jean Planche

Jean Planche 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).

  • Device for electrode-type electrical logging tools and tool incorporating said device
    Patent number: 4286217
    Abstract: A logging tool in accordance with the invention comprises a unitized electrode assembly adapted to be removably mounted on a central mandrel. The unitized electrode assembly comprises a metallic tube that is encased within an electrically-insulating sheath. An insulating sleeve surrounding the sheath carries various electrodes that are separated from each other by insulating spacers.
    Type: Grant
    Filed: February 1, 1979
    Date of Patent: August 25, 1981
    Assignee: Schlumberger Technology Corporation
    Inventors: Jean Planche, Jacques Tromelin, Daniel Vannier