Patents by Inventor Harald Knoll

Harald Knoll 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).

  • Spark plug for an internal combustion engine and process for its manufacture
    Patent number: 6064144
    Abstract: A spark plug, especially one for a gas-fueled internal combustion engine has an electrically conducting spark plug body (1), a central electrode (3) which is located in the spark plug body (1) and which is electrically insulated from and projects away from the spark plug body (1), and a ground electrode (4) which is electrically connected to the spark plug body (1) and is made in the form of an annular electrode. The annular electrode (4) surrounds the front part of central electrode (3) such that an annular ignition gap (ZS) is formed between them. Surfaces of the central electrode (3) and the annular electrode (4) bordering the ignition gap (ZS) are provided with precious metal armorings in the form of sleeves (5, 6,), especially of platinum or a platinum alloy. This yields a spark plug with an extremely long service life.
    Type: Grant
    Filed: February 12, 1998
    Date of Patent: May 16, 2000
    Assignee: Beru AG
    Inventors: Harald Knoll, Erwin Schneck, Werner Niessner, Dirk Von Hacht, Heinz Ambacher