Patents by Inventor Naoki Hanayama

Naoki Hanayama 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).

  • Bis[2-tert-butyl-4-(2-octadecyloxycarbonylethyl)-6-methylphenyl ]phosphite useful as a stabilizing agent
    Patent number: 5169885
    Abstract: Phosphite compounds of the formula ##STR1## wherein R.sup.1 is an alkyl having 1 to 22 carbon atoms, and use thereof. The phosphite compounds of the present invention show stabilizing action on organic materials and are useful as antioxidants. A combined use of the compounds of the present invention with hindered phenol compounds, light stabilizers or thioalkanoate compounds further improves stabilizing effect.
    Type: Grant
    Filed: October 30, 1990
    Date of Patent: December 8, 1992
    Assignees: Yoshitomi Pharmaceutical Industries, Ltd., Mitsubishi Petrochemical Company, Ltd.
    Inventors: Naoki Hanayama, Kazuo Nakagawa, Nobuyuki Hayashi, Akiyoshi Onishi
  • Phosphite compounds
    Patent number: 5077424
    Abstract: Phosphite compounds represented by the formula ##STR1## wherein R.sup.1 stands for a tertiary hydrocarbyl group, R.sup.2 stands for an alkyl group, an aralkyl group which may be substituted, an aryl group or a cycloalkyl group and n stands for 0, 1 or 2.Such compounds possess stabilizing action against organic materials, particularly antioxidant action, and are useful as antioxidants for preventing deterioration by oxidation of organic materials.
    Type: Grant
    Filed: March 17, 1989
    Date of Patent: December 31, 1991
    Assignees: Yoshitomi Pharmaceutical Industries, Ltd., Mitsubishi Petrochemical Company, Ltd.
    Inventors: Naoki Hanayama, Kazuo Nakagawa, Akiyoshi Onishi
  • Method of producing 4-biphenyl p-tolyl ether
    Patent number: 4982010
    Abstract: The use of 1,3-dimethyl-2-imidazolidinone or sulfolane as a reaction promoter is effective in the production of 4-biphenylyl p-tolyl ether, which is useful as a sensitizer for heat-sensitive recording paper, by reacting p-phenylphenol with a p-halotoluene in the presence of a copper catalyst.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: January 1, 1991
    Assignee: Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Naoki Hanayama, Kazuo Nakagawa, Akira Shimada
  • Thermoresponsive recording paper sheet
    Patent number: 4605940
    Abstract: There is provided a thermoresponsive paper sheet comprising a normally colorless or pale-colored chromogenic substance in combination with a phenolic compound and the underlying paper substrate, said sheet further comprises a diether of the formula: ##STR1## wherein R.sup.4 is alkyl of 1 to 5 carbon atoms, benzyl or phenethyl.
    Type: Grant
    Filed: September 11, 1984
    Date of Patent: August 12, 1986
    Assignee: Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Ryoichi Kinishi, Eisaburo Kaku, Naoki Hanayama
  • Thermoresponsive recording sheet
    Patent number: 4558335
    Abstract: There is disclosed the use of benzyl 4-benzyloxybenzoate as a responsiveness-increasing agent in a thermoresponsive recording paper sheet comprising a normally colorless or pale-colored chromogenic substance in combination with a phenolic compound.
    Type: Grant
    Filed: March 11, 1982
    Date of Patent: December 10, 1985
    Assignee: Yoshitomi Pharmaceutical Industries, Ltd.
    Inventors: Naoki Hanayama, Eisaburo Kaku, Ryoichi Kinishi