Patents by Inventor Yutaka Iwamura

Yutaka Iwamura 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 and apparatus for detecting irregular part of optical fiber
    Patent number: 5449393
    Abstract: A method and apparatus are provided for detecting irregular portions of an optical fiber which arise due to microscopic bubbles, bruises, and the like during an optical fiber drawing process. The present invention operates by varying the pulling rate of a pulling capstan based on feeding back measurements of the external diameter of the optical fiber to the pulling capstan. The ratio of a given pulling rate variation to a predetermined time period is then computed. The computed ratio is then compared to a previously specified value.
    Type: Grant
    Filed: February 8, 1994
    Date of Patent: September 12, 1995
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Katsuyuki Tsuneishi, Yutaka Iwamura