Patents by Inventor Yoshiyuki Nakahara

Yoshiyuki Nakahara 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).

  • Process for forming passivated film
    Patent number: 5407492
    Abstract: A process for a passivated film which is far reduced in the amount of gas discharge and can desorb an adsorbed gas more readily, which process comprises heating a stainless member with a surface roughness, Rmax, of 1.0 .mu.m or less in an atmosphere of a mixture comprising oxygen gas and an inert gas and having a dew point of -95.degree. C. or below, an impurity concentration of 10 ppb or less and an oxygen content 5 ppm 25 vol % at 300.degree. to 420.degree. C.
    Type: Grant
    Filed: June 23, 1993
    Date of Patent: April 18, 1995
    Assignee: Osaka Sanso Kogyo Ltd.
    Inventors: Tadahiro Ohmi, Yoshiyuki Nakahara, Takashi Sakanaka, Eiji Ohta, Satoshi Mizokami
  • Metal tube oxidation treatment apparatus
    Patent number: 5295668
    Abstract: It is a metal oxidation treatment apparatus for carrying out the inactivation treatment of metal tubes used especially in a super high purity gas piping system and an apparatus of super high vacuum.The support part of a support member is made as a tubular form member, and a tapered part is provided on the outer periphery thereof, and further, since a spring is mounted to be displaceable, even if fluctuation is present in the internal diameter of stainless steel tubes, it is possible to let the stainless tubes easily be supported on the support part. Also, even fluctuation of the length is present in the stainless steel tubes, the support member is always pushed to the stainless steel tubes. Oxidative gas diffusing out of the tube to be treated to the outside thereof can be released to the outside of the oxidation treatment furnace without letting it contact to the tube to be treated.
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: March 22, 1994
    Assignee: Osaka Sanso Kogyo Kabushiki-Kaisha
    Inventors: Tadahiro Ohmi, Yoshiyuki Nakahara, Shigeki Hayashi, Takashi Sakanaka, Eiji Ohta, Fumio Nakahara
  • Stainless steel surface passivation treatment
    Patent number: 5259935
    Abstract: The present invention provides a method for surface passivating stainless steel articles against the effects of corrosive materials having activities anywhere from aqueous salt solutions to corrosive gases such as hydrogen chloride and silane. Additionally, after the treatment and exposure of the article to moisture, when the article is subsequently flushed with a dry gaseous fluid, the time that the article takes to exhibit an acceptable moisture outgassing rate is reduced over an untreated article. In accordance with the present invention, the surface to be passivated is flushed with a dry gaseous fluid, chemically non-reactive with the stainless steel and containing essentially no oxygen. During such flushing, the articles is baked and cooled. The baking is accomplished at a predetermined temperature and time (preferably between about 250.0.degree. C. and about 500.0.degree. C. for about 4.
    Type: Grant
    Filed: April 29, 1992
    Date of Patent: November 9, 1993
    Assignee: The BOC Group, Inc.
    Inventors: Jeffrey Davidson, Robert Sherman, Richard Paciej, Takashi Sakanaka, Shigeki Hayashi, Yoshiyuki Nakahara