Patents by Inventor Harumichi Watanabe

Harumichi Watanabe 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 preparing oil-soluble nitrogen-containing compounds
    Patent number: 4992150
    Abstract: A process for preparing oil-soluble nitrogen-containing compounds which comprises subjecting nitrogen-containing telogens and alpha-olefin taxogens to radical telomerization reaction. The nitrogen-containing compounds are mixtures of telomers having an average molecular weight not less than 300 and a nitrogen content of from 0.1 to 10 wt %. The compound may be further reacted with boron-bearing compounds or boron compounds to obtain oil-soluble nitrogen and boron-containing compounds. These compounds are useful as additives for fuel oils and lubricating oils.
    Type: Grant
    Filed: April 13, 1989
    Date of Patent: February 12, 1991
    Assignee: Nippon Oil Co, Ltd.
    Inventors: Jinichi Igarashi, Harumichi Watanabe
  • Synthetic lubricating oils
    Patent number: 4737297
    Abstract: A sysnthetic lubricating oil comprising at least one monosubstituted naphthalene derivative such as .beta.-t.-amylinaphthalene, .beta.-(1,1-dimethyldecyl) naphthalene or .beta.-(.alpha.,.alpha.-dimethylbenzyl) naphthalene.
    Type: Grant
    Filed: January 29, 1987
    Date of Patent: April 12, 1988
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Toshio Yoshida, Harumichi Watanabe
  • Synthetic oils
    Patent number: 4714794
    Abstract: A synthetic oil having excellent oxidation stability, comprising a mixture of monoalkylnaphthalenes which have each a secondary alkyl group of 6 to 24 carbon atoms and in which the specific molar ratio of .alpha.- to .beta.-substituted monalkylnaphthalenes is at least 1.0. The synthetic oil is useful as a thermal medium oil or as the main component of a synthetic lubricating oil.
    Type: Grant
    Filed: May 15, 1987
    Date of Patent: December 22, 1987
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Toshio Yoshida, Harumichi Watanabe
  • Thermal medium oils
    Patent number: 4665275
    Abstract: A thermal medium oil comprising at least one monosubstituted naphthalene derivative such as .beta.-(1,1-dimethyloctyl) naphthalene, .beta.-(1,1-dimethylhexyl) naphthalene and 2-t.-amylnaphthalene.
    Type: Grant
    Filed: June 17, 1985
    Date of Patent: May 12, 1987
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Toshio Yoshida, Harumichi Watanabe
  • Metal deactivator and composition containing same
    Patent number: 4392968
    Abstract: The oxidation of a lubricating oil caused by metal components can be suppressed effectively by adding to the lubricating oil a compound represented by the formula ##STR1##
    Type: Grant
    Filed: July 30, 1981
    Date of Patent: July 12, 1983
    Assignee: Nippon Oil Company, Limited
    Inventors: Noboru Ishida, Harumichi Watanabe