Patents by Inventor Kunihide Sawamura

Kunihide Sawamura 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).

  • Optical fiber of high durability prepared from multicomponent glass
    Patent number: 4264131
    Abstract: An optical fiber which consists of a multicomponent core glass member which is formed of SiO.sub.2, Al.sub.2 O.sub.3 and an alkali metal oxide and preferably contains CaO, MgO and B.sub.2 O.sub.3 ; and a multicomponent cladding glass member which is prepared from SiO.sub.2, Al.sub.2 O.sub.3, an alkali metal oxide and at least one component selected from the group consisting of ZnO, ZrO.sub.2 and TiO.sub.2, and preferably contains CaO, MgO and B.sub.2 O.sub.3 ; and consequently reduces transmission loss of light and exhibits prominent durability.
    Type: Grant
    Filed: May 8, 1979
    Date of Patent: April 28, 1981
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Kunihide Sawamura, Mituo Kasori, Takeshi Takano, Hironori Maki