Patents by Inventor Yoshito Nogami

Yoshito Nogami 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
    Patent number: 4097258
    Abstract: An optical fiber comprising a core glass and a cladding glass therearound, wherein at least the core glass contains GeO.sub.2 as an additive to increase the refractive index with respect to the cladding glass. The fiber glass is prepared by heat treating a starting glass to separate out a B.sub.2 O.sub.3 --Na.sub.2 O-rich phase for subsequent acid leaching, and by sintering a residual glass with low concentrations of light absorbing impurities. Ingredients of the starting glass in weight percent are as follows:SiO.sub.2 :25 - 80B.sub.2 o.sub.3 :10 - 30Na.sub.2 O:3 - 12GeO.sub.2 :3 - 40A1.sub.2 o.sub.
    Type: Grant
    Filed: June 16, 1976
    Date of Patent: June 27, 1978
    Assignee: Hoya Glass Works, Ltd.
    Inventors: Susumu Horikawa, Kenji Nakagawa, Yoshito Nogami