Patents by Inventor Yukinaga Yokota

Yukinaga Yokota 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: 5639733
    Abstract: Alkyl glycoside aqueous solutions, which satisfy the following conditions (a) and/or (b):(a) the solution is maintained at a pH value exceeding 7, and(b) the solution contains a water-soluble alcohol, are highly stable with respect to microbial activities, such as putrefaction and fungal growth, and are useful as surface active agents.
    Type: Grant
    Filed: November 14, 1994
    Date of Patent: June 17, 1997
    Assignee: Kao Corporation
    Inventors: Toyomi Koike, Hiroshi Nagumo, Akira Yamamuro, Yukinaga Yokota
  • Patent number: 5637755
    Abstract: To provide a sulfonate represented by the following general formula (1A) which is useful as an organic peracid precursor in bleach compositions for domestic use, a process for producing it, and a bleach composition having no irritative smell, high bleaching power and excellent persistence of the bleaching power during the use: ##STR1## wherein R.sup.1 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, etc., R.sup.2 represents an alkylene group having 1 to 8 carbon atoms, a phenylene group, etc., R.sup.3 represents an alkylene group having 1 to 8 carbon atoms, R.sup.4 represents an alkylene group having 1 to 5 carbon atoms, p is 0 or 1, A represents an alkylene group having 2 to 4 carbon atoms, n is 1 to 100, and Ma represents an alkali metal atom. etc.
    Type: Grant
    Filed: December 5, 1995
    Date of Patent: June 10, 1997
    Assignee: Kao Corporation
    Inventors: Hiroshi Nagumo, Norio Nishikawa, Toyomi Koike, Yukinaga Yokota, Hiroyuki Yamada
  • Patent number: 5401433
    Abstract: A working fluid composition for use in a refrigeration system which comprises a refrigerating oil comprising a compound having one or more ketone groups in the molecular structure as a base oil and a hydrofluorocarbon.
    Type: Grant
    Filed: August 9, 1993
    Date of Patent: March 28, 1995
    Assignee: Kao Corporation
    Inventors: Hiroki Sawada, Toshiya Hagihara, Yuichiro Kobayashi, Akimitsu Sakai, Hideo Suzuki, Toshihiro Tanaka, Hiroshi Nagumo, Yukinaga Yokota
  • Patent number: 5300245
    Abstract: A working fluid composition for use in a refrigeration system which comprises a refrigerating oil comprising a compound having one or more ketone groups in the molecular structure as a base oil and a hydrofluorocarbon.
    Type: Grant
    Filed: June 30, 1992
    Date of Patent: April 5, 1994
    Assignee: Kao Corporation
    Inventors: Hiroki Sawada, Toshiya Hagihara, Yuichiro Kobayashi, Akimitsu Sakai, Hideo Suzuki, Toshihiro Tanaka, Hiroshi Nagumo, Yukinaga Yokota
  • Patent number: 4845002
    Abstract: A toner for development of an electrostatically charged image which comprises at least a binder, a colorant and a compound having the formula (I) or (III): ##STR1## wherein A represents a phenol group-containing compound residue,B represents a group of the general formula (II): ##STR2## wherein R.sub.1 and R.sub.4 each represent a methylene or ethylene group,R.sub.2 and R.sub.3 each represent an alkyl, aryl, alkenyl, aralkyl or cyclic alkyl group or R.sub.2 and R.sub.3 may be combined to form a ring,R.sub.5 represents an alkylene group having 1 to 8 carbon atoms or an arylene group, preferably phenylene,R.sub.6 and R.sub.7 each represent a hydrogen atom or an alkyl, aryl, aminoalkyl, aralkyl or cyclic alkyl group having 1 to 8 carbon atoms or R.sub.6 and R.sub.7 may be combined to form a ring,p represents a number of 1 to 200,n.sub.1 and q each is zero or 1, r is zero or an integer of 1 to 3 and n.sub.2 is an integer of 1 to 3 or zero in the formula (I) and a number of 1 to 400 in the formula (III).
    Type: Grant
    Filed: December 1, 1987
    Date of Patent: July 4, 1989
    Assignee: Kao Corporation
    Inventors: Masao Niki, Shinichiro Yasuda, Yukinaga Yokota, Kazuhiko Okabe
  • Patent number: 4792622
    Abstract: A secondary amine is effectively prepared by reacting an alcohol or an aldehyde with a primary amine in the presence of a catalyst of copper, nickel and a metal element belonging to the platinum group VIII at a pressure of the atmospheric pressure to 5 kg/cm.sup.2 G at a temperature of 150.degree. to 250.degree. C., while water produced in the reaction is being removed out, and separating the resulting secondary amine from the product mixture.
    Type: Grant
    Filed: November 21, 1986
    Date of Patent: December 20, 1988
    Assignee: Kao Corporation
    Inventors: Yukinaga Yokota, Yuzi Sawamoto, Hideki Taniguchi, Kazuhiko Okabe
  • Patent number: 4757144
    Abstract: A tertiary amine is effectively prepared by reacting a primary or secondary amine with formaldehyde in the presence of a palladium or platinum catalyst at a hydrogen pressure of 3 to 50 kg/cm2 (gauge pressure) at a temperature of 80.degree. to 180.degree. C., by controlling the addition of formaldehyde to the starting amine.
    Type: Grant
    Filed: September 30, 1986
    Date of Patent: July 12, 1988
    Assignee: Kao Corporation
    Inventors: Kazuhiko Okabe, Yukinaga Yokota, Kazuhito Matsutani, Tatuhiro Imanaka
  • Patent number: 4714719
    Abstract: A polyurethane is prepared with use of a catalyst comprising a compound having the formula: ##STR1## in which n is an integer of 2 to 12, A is a hydrogen or a group of --CH.sub.2 CHRCH.sub.2 NH.sub.2 and R is hdyrogen or methyl, provided that n is 6 when A is hydrogen. The compound scarcely smells and does not elute out of the polyurethane article. The process is easy to control.
    Type: Grant
    Filed: November 4, 1986
    Date of Patent: December 22, 1987
    Assignee: Kao Corporation
    Inventors: Harumasa Yamasaki, Masayoshi Morii, Yukinaga Yokota, Akira Mamada, Yoshiyuki Nabata
  • Patent number: 4625063
    Abstract: A tertiary amine of a high purity is prepared from an alcohol or an aldehyde and a primary or second amine at a low temperature, using a catalyst of copper, nickel and an element belonging to the VIII platinum group such as platinum, palladium, ruthenium and rhodium, while removing out water formed by the reaction.
    Type: Grant
    Filed: June 6, 1985
    Date of Patent: November 25, 1986
    Assignee: Kao Corporation
    Inventors: Yukinaga Yokota, Yuji Sawamoto, Hideki Taniguchi, Kazuhiko Okabe
  • Patent number: 4100127
    Abstract: A film-forming liquid resin dispersion is prepared by dispersing a surface active polyester in a collidal form in water or an aqueous solution containing a small amount of a base and grafting a vinyl compound monomer and/or an acrylic or methacrylic acid ester monomer to the surface active polyester.
    Type: Grant
    Filed: February 9, 1977
    Date of Patent: July 11, 1978
    Assignee: Kao Soap Co., Ltd.
    Inventors: Hiroshi Fukusaki, Masao Niki, Yukinaga Yokota
  • Patent number: 4090991
    Abstract: An oil-in-water emulsion of a vinyl polymer is prepared by emulsion polymerizing a vinyl monomer in the presence of a polyester having a surface active property.
    Type: Grant
    Filed: February 3, 1977
    Date of Patent: May 23, 1978
    Assignee: Kao Soap Co., Ltd.
    Inventors: Hiroshi Fukusaki, Masao Niki, Yukinaga Yokota
  • Patent number: 4002700
    Abstract: A liquid resinous composition is prepared by reacting a dibasic acid component containing .alpha.,.beta.-unsaturated basic acid with a glycol component to form an unsaturated polyester having an acid value of at least 10 and a molecular weight of 1,000 to 10,000, mixing the polyester with a basic substance to neutralize unreacted carboxyl groups and then subjecting the resulting water solubilized unsaturated polyester to addition reaction with a monovinyl compound. The composition is suited for adhesive, coating, printing ink, and binder.
    Type: Grant
    Filed: November 10, 1975
    Date of Patent: January 11, 1977
    Assignee: Kao Soap Co., Ltd.
    Inventors: Hiroshi Fukuzaki, Masao Niki, Yukinaga Yokota, Jun-ichi Furukawa