Patents by Inventor Tetuya Hasegawa

Tetuya Hasegawa 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).

  • Dry writing board possessing anti-halation effect and process for producing the same
    Patent number: 4123590
    Abstract: A dry writing board possessing an anti-halation effect which comprises a metallic plate having a ground coat fire-coated with a glaze comprising an acid component and a base component, the composition of the glaze being 30 to 45% of silicon oxide, 15 to 25% of titanium oxide, 5 to 10% of sodium oxide, 5 to 15% of potassium oxide, 1 to 5% of calcium oxide, 2 to 5% of aluminum oxide and 10 to 20% of boron trioxide, all percentages being by weight.
    Type: Grant
    Filed: December 23, 1975
    Date of Patent: October 31, 1978
    Assignee: Pilot Man-Nen-hitsu Kabushiki Kaisha
    Inventors: Tetuya Hasegawa, Akihiro Itishasi