Patents by Inventor Tamio Usami

Tamio Usami 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).

  • Element and method for detecting leakage of petroleum products
    Patent number: 3970863
    Abstract: A styrene-butadiene-styrene block copolymer containing 50 to 70% by weight of butadiene can be used as a base material of an element capable of detecting leakage of petroleum products by detecting to the change in an electrical signal. By use of this detecting element any leakage of petroleum products from a transportation pipe line may be detected and located quickly and precisely.
    Type: Grant
    Filed: December 13, 1974
    Date of Patent: July 20, 1976
    Assignees: Sumitomo Chemical Company, Limited, Japanese National Railways
    Inventors: Hiroshi Kishikawa, Takayoshi Adachi, Tamio Usami