Patents by Inventor Ko Itaya

Ko Itaya 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).

  • High strength glass made by ion exchange
    Patent number: 3959000
    Abstract: A SiO.sub.2 -Al.sub.2 O.sub.3 -Na.sub.2 O-Li.sub.2 O glass which can be strengthened in a short time, typically in less than about thirty minutes, by an alkali metal ion exchange method to produce a high strength glass having an improved compressive surface layer of relatively large thickness can be obtained by substituting Li.sub.2 O for a portion of Na.sub.2 O content in a glass consisting essentially of SiO.sub.2, Al.sub.2 O.sub.3, Na.sub.2 O, Li.sub.2 O and F.sub.2.
    Type: Grant
    Filed: April 30, 1974
    Date of Patent: May 25, 1976
    Assignee: Hoya Glass Works
    Inventors: Kenji Nakagawa, Ko Itaya