Patents by Inventor Yuji Shimomura

Yuji Shimomura 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).

  • Patent number: 6228282
    Abstract: A refrigerating machine oil composition comprising: (A) an alicyclic polycarboxylic acid ester compound having an alicyclic ring and at least two ester groups represented by formula (1) bonded to adjacent carbon atoms of the alicyclic ring: —COOR1  (1) wherein R1 represents a hydrocarbon group having 1-30 carbon atoms, and R1 of each of the ester groups may be the same or different from each other; and (B) at least one epoxy compound selected from a group consisting of glycidyl ester epoxy compounds and alicyclic epoxy compounds.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: May 8, 2001
    Assignee: Nippon Mitsubishi Oil Corp.
    Inventors: Yuji Shimomura, Satoshi Suda, Hiroyuki Hirano
  • Patent number: 5464550
    Abstract: A refrigerator oil composition for a fluoroalkane refrigerant comprises a base oil composed principally of at least one oxygen-containing compound and, based on the total weight of the composition, [I] 0.5-5.0 wt. % of a phosphate ester represented by the formula (A), and [II] (a) 0.1-5.0 wt. % of a halogenated phosphate ester represented by the formula (B) and/or (b) 0.01-2.0 wt. % of an acid phosphate ester represented by the formula (C), an amine salt thereof or a combination of both the acid phosphate ester and the amine salt. ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 represent a C.sub.1-18 hydrocarbon or oxygen-containing hydrocarbon group; R.sup.4, R.sup.5 and R.sup.6 represent a C.sub.1-18 hydrocarbon or oxygen-containing hydrocarbon group or a group similar to the C.sub.
    Type: Grant
    Filed: November 22, 1994
    Date of Patent: November 7, 1995
    Assignee: Nippon Oil Company, Limited
    Inventors: Umekichi Sasaki, Hiroshi Hasegawa, Yuji Shimomura