Patents by Inventor Thomas Y. Kometani

Thomas Y. Kometani 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).

  • Method of preparing optical fibers of silica
    Patent number: 4282196
    Abstract: A hydrolysis method of purifying silicon tetrachloride is shown that reduces losses in optical fibers made from silica produced therefrom. Water is added to impure liquid silicon tetrachloride, which forms a gel which is then separated from the remaining SiCl.sub.4. Metal impurities, OH-containing impurities, and SiHCl.sub.3 are removed by this process. In a preferred embodiment, the water is added by bubbling a wet gas through the SiCl.sub.4. A residual amount of OH containing impurities and HCl is left after the hydrolysis, which impurities may be further removed by a refluxing technique.
    Type: Grant
    Filed: October 12, 1979
    Date of Patent: August 4, 1981
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Thomas Y. Kometani, Darwin L. Wood