Patents by Inventor Sabro Koyama

Sabro Koyama 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).

  • Metal working oil composition
    Patent number: 5599780
    Abstract: A metal working oil composition having a kinematic viscosity of 20 cSt or less at a temperature of 40.degree. C. is herein disclosed which comprises (A) 10% by weight or more of an n-.alpha.-olefin (e.g. 1-hexadecene) and (B) an overbased sulfonate having a total base number of 350 mg.multidot.KOH/g or more in such an amount that the total base number of the composition is 12.5 mg.multidot.KOH/g or more. The metal working oil composition is particularly suitable as a press lubricant for aluminum alloys, has an excellent mass workability, and is more excellent in coating workability, lubricity, degreasing properties, weldability, etc. than a conventional solid coating type lubricant.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: February 4, 1997
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Sabro Koyama, Tahei Okada, Yoshiaki Aiki