Patents by Inventor Tetsunori Hayafuji

Tetsunori Hayafuji 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).

  • Fe-Ni based alloy sheet having superior surface characteristic and superior etchability
    Patent number: 5958331
    Abstract: A Fe--Ni based alloy sheet having superior surface characteristic and superior etchability, essentially consisting, by weight, of 30 to 50% nickel, 0.05 to 0.5% manganese, 0.001 to 0.02% silicon, not more than 0.0015% aluminum, not more than 150 ppm oxygen, and the balance iron and incidental impurities, the value of Mn content(weight %)/Si content (weight %) being not less than 20. Preferably, silicon content is 0.001 to 0.01%, aluminum being not more than 0.0005%, oxygen being not more than 90 ppm, sulfur which is one of important impurities being not more than 0.005%, and boron which is one of important impurities being not more than 0.005%.
    Type: Grant
    Filed: April 20, 1998
    Date of Patent: September 28, 1999
    Assignee: Hitachi Metals, Ltd.
    Inventors: Takeo Mizuguchi, Makoto Ishihara, Tetsunori Hayafuji, Hidemi Takao