Patents by Inventor Noboru Ishii

Noboru Ishii 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).

  • Furnace taphole drilling bit
    Patent number: 4047514
    Abstract: A drilling bit for use in making a taphole in a blast furnace. The drilling bit has a bit head having a plurality of cutting tips radially arranged on and soldered to the bit head. Soldering of the tips to the bit head is carried out by the use of a soldering material of a particular composition containing 3 to 5% by weight of carbon, 0.5 to 3.0% by weight of silicon and the balance iron, the sum of the carbon content and the silicon content in the composition being at least 4% by weight relative to the total weight of the composition. Each of the tips which are to be soldered to the bit head by the use of the particular soldering material is made of either stellite or a super hard alloy.
    Type: Grant
    Filed: October 12, 1976
    Date of Patent: September 13, 1977
    Assignee: Toyo Kogyo Co., Ltd.
    Inventors: Tsuyoshi Morishita, Kenji Miyake, Noboru Ishii, Toshikazu Wakigara, Naoji Ueda