Patents by Inventor Sadayoshi Mukai

Sadayoshi Mukai 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: 5062292
    Abstract: A device for measuring a gas dissolved in an oil comprising a sample container for containing a sample oil, an air bubble generator for extracting the gas dissolved in the oil, a gas container for containing the gas, a gas sensor for detecting the gas charged in the gas container, gas measuring means for measuring a concentration of the gas in response to a signal dispatched from the gas sensor, and a pump for supplying air to the air bubble generator.
    Type: Grant
    Filed: May 8, 1990
    Date of Patent: November 5, 1991
    Assignee: Nissin Electric Co., Ltd.
    Inventors: Masaru Kanba, Yasuo Inoue, Sadayoshi Mukai, Masanari Kikkawa, Yasunori Suga
  • Patent number: 4330439
    Abstract: The electric device according to the present invention has as its constituents the insulating materials and elements comprising films of synthetic resin, for instance, polypropylene, impregnated with 1-phenyl-2-ethylphenylethane and/or 1-phenyl-2-isopropylphenylethane.According to the present invention, insulating oils having favorable compatibility with the film of synthetic resin such as polypropylene and favorable affinity to metals and having low viscosity have been provided, and in addition, electric devices excellent in properties of withstanding a high voltage and dielectric properties in a broad range of temperature from a low temperature to a high temperature have also been offered.
    Type: Grant
    Filed: October 29, 1980
    Date of Patent: May 18, 1982
    Assignees: Kureha Kagaku Kogyo Kabushiki Kaisha, Nissin Electric Co., Ltd.
    Inventors: Mineaki Nishimatsu, Sadayoshi Mukai, Yoshinori Hayashi, Osamu Yamaguchi, Akira Ito, Nobuo Ahiko
  • Patent number: 4288837
    Abstract: An electrical capacitor comprising a capacitor element impregnated with a mixture of di-iso-propyl naphthalene and mono-iso-propyl naphthalene, the amount of which latter being 10% to 60% by weight, and preferably 20% to 40% by weight.
    Type: Grant
    Filed: July 23, 1979
    Date of Patent: September 8, 1981
    Inventors: Mineaki Nishimatsu, Sadayoshi Mukai, Yoshinori Hayashi, Osamu Yamaguchi, Akira Ito, Yasutoshi Hara
  • Patent number: 4203933
    Abstract: A method of purifying triaryl phosphate to be used as electrical insulating oil, comprising a first step of washing the phosphate with the aqueous solution of alkali, a second step of diluting the phosphate with aromatic insulating oil, a third step of treating the diluted phosphate with acid clay in an atmosphere of dry gas so that the acid clay adsorbs the impurities in the phosphate and a fourth step of treating the phosphate under reduced pressure for removal of any remaining impurities therefrom.
    Type: Grant
    Filed: May 9, 1978
    Date of Patent: May 20, 1980
    Inventors: Sadayoshi Mukai, Yoshiaki Otani, Osamu Yamaguchi
  • Patent number: 4184190
    Abstract: An electrical capacitor using as the insulating oil a mixture of triaryl phosphate, diisopropyl naphthalene and monoisopropyl naphthalene. The phosphate has the structural formula of ##STR1## wherein n=1 to 3; R and R' are alkyl groups, the number of R being 1 and the number of R' being 0 or 1, and the total number of carbon atoms contained in the alkyl group or groups attached to each benzene ring is 1 to 5.
    Type: Grant
    Filed: May 9, 1978
    Date of Patent: January 15, 1980
    Inventors: Sadayoshi Mukai, Yoshiaki Otani, Osamu Yamaguchi
  • Patent number: 3959162
    Abstract: An insulating oil for use in electrical devices, comprising a mixture of trixylenylphosphate and 10% to 40% by volume of insulating oil having a viscosity of 5 cp to 15 cp at 30.degree.C and selected from the group consisting of mineral oil, alkylbenzene, alkylnaphthalene, diallylalkane, 2-diphenylmethylether, 2-diphenyl-isopropylether, paraffin hydrocarbon oil and naphthene hydrocarbon oil.
    Type: Grant
    Filed: August 2, 1974
    Date of Patent: May 25, 1976
    Assignee: Nissin Electric Co., Ltd.
    Inventors: Mineaki Nishimatsu, Sadayoshi Mukai, Kaname Ishida
  • Patent number: 3937664
    Abstract: An oil-filled electrical device comprising a casing, an electrical device element in the casing and an insulating oil consisting essentially of one or more 2-diphenylalkylether having the structural formula of ##SPC1##Wherein R is the alkyl group expressed as C.sub.n H.sub.2n.sub.+1 wherein R is 1.ltoreq.n423.8.
    Type: Grant
    Filed: March 25, 1974
    Date of Patent: February 10, 1976
    Assignees: Nissin Electric Co., Ltd., Sugai Chemical Industry Co., Ltd.
    Inventors: Fumio Tanimoto, Mineaki Nishimatsu, Sadayoshi Mukai, Kaname Ishida