Patents by Inventor Tatsuo Saitoh

Tatsuo Saitoh 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 measuring characteristics of optical fiber and method of rewinding optical fiber
    Publication number: 20040028372
    Abstract: An optical fiber is immersed in a liquid having a low viscosity of not more than 1 Pa·s at 20° C., so that the liquid can permeate into gaps between turns of the optical fiber, and stresses, caused by a result of contact between the turns of the optical fiber, are eliminated, and in this state transmission characteristics of the optical fiber are measured.
    Type: Application
    Filed: March 14, 2003
    Publication date: February 12, 2004
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD
    Inventors: Katsuya Nagayama, Osamu Kasuu, Tatsuo Saitoh
  • Method of manufacturing fiber preform for single-mode fibers
    Patent number: 4875918
    Abstract: A method of manufacturing a glass fiber preform in which a quartz glass rod having an outer coating containing chlorine and a core doped for higher refractive index has blown thereon a soot formed by a burner fed with quartz glass raw material and a chlorine group gas undergoing flame hydrolysis. The resulting composite is the heated and fused to collapse.
    Type: Grant
    Filed: December 19, 1988
    Date of Patent: October 24, 1989
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Futoshi Mizutani, Takeshi Kyogoku, Tatsuo Saitoh, Shigeki Endoh
  • Snap ring intended for prevention of looseness of a nut
    Patent number: 4405274
    Abstract: A snap ring is attachable to and detachable from a bolt with ease, the snap ring having a twisted part that enables the snap ring to extend around portions of two adjacent convolutions of the thread, the snap ring also having a split to enable portions of the snap ring to pass from one convolution to an adjacent convolution over the crest of a thread to thereby prevent the nut from coming off the bolt.
    Type: Grant
    Filed: January 27, 1982
    Date of Patent: September 20, 1983
    Assignee: Toho Asechiren Kabushiki-kaisha
    Inventors: Tatsuo Saitoh, Tsutomu Hasebe